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The Abwehr was a German military intelligence (information gathering) organization which existed from 1920 to 1945. Despite the fact the Treaty of Versailles prohibited the establishment of a German intelligence organization altogether, they formed an espionage group in 1920 within their defence ministry, calling it the Abwehr with its purpose being defence against foreign espionage - an organizational role which evolved considerably over time. As part of its implied task of counterespionage, the Abwehr gathered both domestic and foreign information, most of it human intelligence in nomenclature. Under General Kurt von Schleicher the individual military service intelligence units were combined and in 1929, placed under his Ministry of Defence, forming the foundation for the more commonly understood manifestation of the Abwehr. Each Abwehr station throughout Germany was based on military (army) districts and more offices were opened in amenable neutral countries and in the occupied territories as the greater Reich expanded. When Hitler replaced the Ministry of War with the OKW and made the organization part of the Führer's personal "working staff" in June 1938, the Abwehr became its intelligence agency and Vice-Admiral Wilhelm Canaris was placed at the head of the organization. The headquarters (HQ) of the Abwehr were located at 76/78 Tirpitzufer, Berlin, adjacent to the offices of the OKW.
The Abwehr was created in 1920 as part of the Ministry of Defence (Germany) when the German government was allowed to form the Reichswehr, the military organization of the Weimar Republic. The first head of the Abwehr was Major Friedrich Gempp, a former deputy to Colonel Walter Nicolai, the head of German intelligence during World War I, who proved mostly ineffectual. At that time it was composed of only three officers and seven former officers, plus a clerical staff. When Gempp became a general, he was promoted out of the job of Abwehr Chief, to be followed by Major Günther Schwantes, whose term as the organization's leader was also brief. Many members of the Reichswehr (a significant portion of them Prussian) declined when asked to consider intelligence work, since for them, it was outside the realm of actual military service and the act of spying clashed with their Prussian military sensibilities of always showing themselves direct, loyal, and sincere. By the 1920s, the slowly growing Abwehr was organized into three sections:
In the 1930s, with the rise of the Nazi movement, the Ministry of Defence was reorganized; surprisingly, on 7 June 1932, a naval officer, Captain Konrad Patzig, was named chief of the Abwehr, despite the fact that it was staffed largely by army officers. Proving himself quite a capable Chief, Patzig swiftly assured the military of his intentions and worked to earn their respect; he established good connections with the Lithuanian clandestine service against the Soviets, forged relations with other agencies - except for Italy, whose cipher he distrusted. His successes did not stop the other branches of the military services from developing their own intelligence staffs.
After the Nazis seized power, the Abwehr began sponsoring reconnaissance flights across the border with Poland, under the direction of Patzig, but this soon led to confrontations with Heinrich Himmler, head of the SS. Army leaders also feared that the flights would endanger the secret plans for an attack on Poland. Adolf Hitler ordered the termination of the overflights in 1934 after he signed a nonaggression treaty with Poland since these reconnaissance missions might be discovered and jeopardize the treaty. Patzig was fired in January 1935 as a result, and was sent to command the new pocket battleship Admiral Graf Spee; he later became Chief of Naval Personnel. His replacement was another Reichsmarine captain, Wilhelm Canaris.
Before he took over the Abwehr on 1 January 1935, the soon-to-be Admiral Canaris was warned by Patzig of attempts by Himmler and Reinhard Heydrich to take over all German intelligence organizations. SD Chief Heydrich's negative attitude towards the Abwehr was shaped in part by his belief that Germany's loss during the First World War was primarily attributable to military intelligence failures, and by his ambitions to resolutely control an all-encompassing political intelligence agency.
Canaris, a master of backroom dealings, thought he knew how to deal with Heydrich and Himmler. Even though he tried to maintain an at least cordial relationship with them, the antagonism between the Abwehr and the SS did not stop with Canaris at the helm. Not only was competition with Heydrich and Himmler's intelligence operations a hindrance, so too were the redundant attempts by multiple organizations to control communications intelligence (COMINT) for the Reich. For instance, Canaris's Abwehr controlled the Armed Forces Deciphering operation, while the navy maintained its own listening service, known as the B-Dienst. Further complicating COMINT matters, the Foreign Office also had its own communications security branch, the Pers Z.
It came to a head in 1937 when Hitler decided to help Joseph Stalin in the latter's purge against the Soviet military. Hitler ordered that the German Army staff should be kept in the dark about Stalin's intentions, for fear that they would warn their Soviet counterparts due to their long-standing relations. Accordingly, special SS teams, accompanied by burglary experts from the criminal police, broke into the secret files of the General Staff and the Abwehr and removed documents related to German-Soviet collaboration. To conceal the thefts, fires were started at the break-ins, which included Abwehr headquarters.
Unaware that Canaris would eventually try to subvert his plans, Hitler sent his Abwehr chief on a special envoy to Madrid (since he spoke fluent Spanish and knew Franco) during the early summer of 1936 to convince Spain to join in the coming fight against the Allies (Hitler sought the use of Gibraltar as a strategic launching pad). Instead of convincing Franco to assist the Nazi regime, Canaris advised him to stay out of the fight since he was certain the war was going to end in disaster for Germany. Thus, instead of helping the Nazis dupe their enemies and elicit allies to their side, the Abwehr (by way of Canaris and others) was covertly undermining the regime under which they served.
Before the reorganization of the OKW in 1938, the Abwehr was merely a department within the Reichsministerium (Defence Ministry), and it was not until Canaris was appointed head of the operation did it grow in size and gain some independence. Experiencing an explosion in personnel of sorts, the Abwehr went from less than 150 employees to nearly one-thousand between 1935 and 1937. Canaris reorganized the agency in 1938, subdividing the Abwehr into three main sections:
Abwehr liaisons were also established with the Army, Navy and Luftwaffe High Commands, and these liaisons would pass on specific intelligence requests to the operational sections of the Abwehr.
Abwehr I was commanded by Colonel Hans Pieckenbrock, Abwehr II was commanded by Colonel Erwin von Lahousenand Abwehr III was commanded by Colonel Egbert Bentivegni. These three officers formed the core of the Abwehr.
Under the structure outlined above, the Abwehr placed a local station in each military district in Germany, ("Wehrkreis"), called 'Abwehrstelle' or 'Ast'. Following the German Table of Organisation and Equipment model of Abwehr headquarters, each Ast was usually subdivided into sections for
Typically each Ast would be commanded by a senior Army or Naval officer and would be answerable to Abwehr HQ. in Berlin. Operations carried out by each Ast would be in tandem with the overall strategic plan formulated by Admiral Canaris. Canaris in turn would receive instructions on what intelligence gathering should take priority from the OKW or, increasingly after 1941, Hitler directly. In practice, each Ast was given considerable latitude in mission planning and execution - a facet of the organisation which ultimately damaged its intelligence gathering capability.
Each local Ast could recruit potential agents for missions and the Abwehr also employed freelance recruiters to groom and vet potential agents. In most cases, the agents who formed the Abwehr were recruited civilians, not officers/soldiers from the military. The recruitment emphasis seems to have been very much on "quantity" not "quality". The poor quality of recruits often led to the failure of Abwehr missions.
In neutral countries the Abwehr frequently disguised its organisation by attaching its personnel to the German Embassy or to trade missions. Such postings were referred to as "War Organisations" ("Kriegsorganisationen" or "KO's" in German). In neutral but friendly Spain for example, the Abwehr had both an Ast and a KO while Ireland had neither. In friendly countries of interest, occupied countries, or in Germany itself, the intelligence service would normally organise "Abwehr sub-stations" ("Abwehrleitstellen" in German or "Alsts" in German), or "Abwehr adjoining posts" ("Abwehrnebenstellen" in German). The "Alsts" would fall under the jurisdiction of the geographically appropriate Ast, which in turn would be supervised by the Central division in Berlin. For a while, the KOs were tolerated by the neutral countries and those who feared Germany too much to protest but as the Allied powers waged war against Germany, many of the KOs were simply expelled at the host countries request - due at least in part to pressure from the Allies.
During his reorganisation, Canaris took care to surround himself with a hand-picked staff, notably his second-in-command, Hans Oster and Section II Chief, Erwin von Lahousen. All but one were not members of the Nazi Party. The exception was Rudolf Bamler, who was appointed chief of Section III by Canaris to gain the trust of Himmler. Canaris did make sure to keep Bamler on a short leash and restricted his access to operational information. Canaris had good reason to do this because unknown to the High Command and Hitler, during his reorganisation Canaris had peppered the chief operational and administrative staff of the Abwehr with men more loyal to him than to the Nazi Government. While outwardly Canaris appeared to be the model of intelligence-gathering efficiency, evidence exists that he secretly opposed, and actively worked against the wishes of Hitler. Canaris, Oster and the Chiefs of Abwehr sections I.,II., and III. were all heavily involved in what the Sicherheitsdienst (SD - Security Service) were to later dub "The Black Orchestra" ("Die Schwarze Kapelle" in German), a plot to overthrow the Nazi regime from the inside. Canaris's operational decisions, his choice of appointments and their decisions, and crucially for the Third Reich–the input each plotter had into Abwehr operations, were all tainted by these secret dealings.
Before the war began, the Abwehr was fairly active and more effectual than they are often depicted and built a wide-range of contacts; they developed links with the Ukrainians opposed to the Soviet regime, conducted meetings with Indian nationalists who were trying to free themselves from the yoke of British imperialism, and established an information-sharing agreement with the Japanese. There was even some significant penetration into the extent of the United States industrial capacity and economic potential, as well as some over the American military capacity and contingency planning.
Sometime in March 1937, senior Abwehr officer Paul Thümmel provided a vast array of significant information about the German intelligence services to Czech agents who in turn, forwarded the data to SIS London. Thümmel also delivered details over "military capabilities, and intentions" as well as "detailed information on the organization and structure of the Abwehr and Sicherheitsdienst (SD)” along with "the near-complete order of battle of the Wehrmacht and Luftwaffe, and German mobilization plans"; and worse, later "he gave advanced warnings of the German annexation of the Sudetenland as well as the invasions of Czechoslovakia and Poland." 
After Hitler’s assumption of absolute control over the OKW in February 1938, he declared that he did not want men of intelligence under his command, but men of brutality, an observation which did not sit well with Canaris. Whether he was deeply troubled by Hitler’s comment or not, Canaris and the Abwehr still busied themselves preparing the ideological groundwork for the annexation of Austria which occurred during the second week of March 1938.
A month later, Canaris and the Abwehr were set to work subverting the Czechs as part of Hitler’s strategy to acquire the Sudetenland. All throughout the process, the Abwehr chief and his subordinates worked to prevent war to the extent feasible. Meanwhile, Canaris participated in the plots brewing among the military leadership for a coup against Hitler and attempted to open up covert communication lines with the British, ever fearful that Hitler would push Europe to war. Before the actual invasion of the Polish Corridor occurred, the Abwehr went so far as to send a special emissary, Ewald von Kleist-Schmenzin, to London in order to warn them. Subverting the Nazi government with warnings to the Allies was but one part of the picture, as this move did not stop or deter the Abwehr Chief from obeying Hitler's orders to provide 150 Polish army uniforms and small arms to Himmler and Heydrich for their 'staged' attack of a German radio station by 'Polish' forces, an act which Hitler used to justify his assault on Poland.
Under Canaris the Abwehr expanded and proved relatively efficient during the early years of the war. Its most notable success was Operation Nordpol, which was an operation against the Dutch underground network, which at the time was supported by the British Special Operations Executive. Concomitant to the period known as the Phoney War, the Abwehr collected information on Denmark and Norway. Shipping in and out of Danish and Norwegian ports was placed under observation and over a 150,000 tons of shipping was destroyed as a result. Agents in Norway and Denmark successfully penetrated their military thoroughly enough to determine the disposition and strength of land forces in both countries and deep-cover Abwehr operatives kept the German forces, particularly the Luftwaffe, intimately informed during the invasion of Norway. Against both of these nations, the Abwehr mounted what one would call a successful intelligence operation of some scale and proved themselves critical to the success of German military endeavors there.
Fear over the drastically low levels of available petroleum at the beginning of 1940 prompted activity from the German Foreign Office and the Abwehr in an attempt to ameliorate the problem "by concluding an unprecedented arms-for-oil" deal, brokered so as to push back the "Anglo-French dominance in the Ploesti oilfield." Abwehr operatives also played on Romanian fears, softening them up and making them more amenable to Hitler’s offer to shield them from the Soviets - through which the Germans acquired cheap oil. In this regard, the Abwehr provided some semblance of economic utility for the Nazi regime.
In March 1941, the Germans forced a captured SOE radio operator to transmit messages to Britain in a code that the Germans had obtained. Even though the operator gave every indication that he was compromised, the receiver in Britain did not notice this. Thus the Germans had been able to penetrate the Dutch operation and maintained this state of affairs for two years, capturing agents that were sent and sending false intelligence and sabotage reports until the British caught on. On the other hand, evidence published by Anthony Cave Brown in Bodyguard of Lies suggests that the British were well aware that the radios were compromised and used this method to feed false information to the Germans regarding the site of the D-Day landings.
Initial estimates of the Soviet army's will and capability were low, a line of thinking shared across the Nazi hierarchy. A great deal has been made by historians over this fact, but some of the German General Staff's optimism was the result of estimates provided by the Abwehr, whose assessments left the German General Staff believing that the Red Army only possessed ninety infantry divisions, twenty-three cavalry divisions, and a mere twenty-eight mechanized brigades. By the time the reappraisal of the Red Army by German military intelligence occurred in mid-June 1941 (which was about 25 percent higher than previously reported), it was a foregone conclusion that the Hitler’s invasion of the Soviet Union was going to take place. Late assessments from the Abwehr contributed to military overconfidence and their reporting mechanism said nothing of the massive mobilization capability of the Soviet Union, another oversight and a major factor which arguably contributed to the German defeat since time-tables were so important for the Germans to succeed. Failure by the German Army to reach their objectives in short-order was crucial and once winter came, this reality caused massive suffering for German forces whose supplies could hardly reach them. Overestimating their capabilities and trusting their own assessments too much, as well as underestimating their enemies (especially the Soviets and the Americans), atop long-standing traditions of unconditional obedience comprised a historically central weakness in the German system.
On 8 September 1941, under the auspices of the Commissar Order (Kommissarbefehl) the OKW issued a decree concerning the ruthless ideological imperatives of the Nazi state against all semblance of Bolshevism, a provision which included executing Soviet prisoners of war. Head of the OKW Ausland/Abwehr, Admiral Canaris, immediately expressed concern about the military and political ramifications of this order which were refuted by higher OKW leadership. Killing soldiers and even non-combatants in contravention of the Geneva Convention was not something the Abwehr leadership could support.
The Abwehr was active in North Africa during the Desert Campaigns of 1941-42. Major Witilo von Griesheim was sent to (Italian) Libya in early 1941 to set up AST Tripoli (code name WIDO). He soon set up a network of agents and wireless stations gathering information in Libya and in the surrounding French territories. Simultaneously, an Abwehr commando under the command of Major Nikolaus Ritter was sent to Libya in February 1941 (including the Hungarian desert explorer László Almásy with a mission to gather intelligence from British occupied Egypt. After Ritter's injury and departure Almásy took command, and organised the 1942 Operation Salam which succeeded in delivering two German agents to Egypt across the Libyan Desert behind enemy lines. The Abwehr was also responsible for Sonderkommando Dora, a mostly scientific mission based in Hun (Libya) to study desert topography and terrain and assess results for military use.
Needing upwards of 500 more agents to supplement intelligence operations in North Africa, prompted the Abwehr to get creative. Arab prisoners of war (POW) languishing in French camps were offered a trip home by parachute if they agreed to spy for the Germans in North Africa as were Soviet POWs in the east. Other intelligence collection efforts by the army, working closely with the Luftwaffe, included the tasking of aerial reconnaissance missions over North Africa. Previously, aerial reconnaissance was ordered by army intelligence officers of the Army Group HQ (part of the structure to which the Abwehr was assigned), but this power was transferred to the Luftwaffe entirely in December 1941.
Just how committed to German victory were typical members of the Abwehr is difficult to know, but if its leadership tells a story, it is not one of conviction. For instance, during March 1942 when many Germans were still brimming with confidence in their Führer and their army, despite ongoing and determined Allied resistance, Abwehr chief, Admiral Canaris, saw things otherwise and told General Friedrich Fromm that there was no way Germany could win the war.
Canaris made the United States one of Abwehr's primary targets even before America's entry into the conflict. By 1942, German agents were operating from within all of America's top armaments manufacturers. Operation Vinland, a particularly intriguing case, centered around a female Abwehr agent who infiltrated a US Naval shipyard in the Midwest (Evansville, Indiana) but escaped. The Abwehr also suffered a very public debacle in Operation Pastorius, which resulted in the executions of six Abwehr agents sent to the United States to sabotage the American aluminum industry. The Abwehr attempted use coercion as a means to infiltrate the United States when they 'recruited' naturalized American citizen visiting Germany, William G. Sebold, by Gestapo threats and blackmail, code-naming him TRAMP and assigning him the task of "serving as radio and microfilm channel for Major Nikolaus Ritter, head of the Abwehr Hamburg post's air intelligence section". Unfortunately for the Germans, who used Sebold successfully for a short period, he was discovered and became a counterspy, and his communications to Germany were screened by the FBI. Not every spy the Abwehr sent was captured or converted in this manner, but the Americans, and especially the British, proved mostly successful in countering the efforts of the German Abwehr officers and used them to their advantage in many ways.
The Abwehr's effectiveness was impaired by agents who aided the Allies in whatever covert means were necessary. Canaris personally gave false information which discouraged Hitler from invading Switzerland (Operation Tannenbaum). He also persuaded Francisco Franco not to allow German forces to pass through Spain to invade Gibraltar (Operation Felix), but it may have been just as much the imposition of the SD in Spain that strengthened Franco's intransigence to Hitler and the Nazi regime.
Still, images of the Abwehr as a veritable organ of resistance inside the heart of the Third Reich are not an accurate reflection across the spectrum of its entire operations or its personnel. There were assuredly committed Nazis in it ranks. During January of 1942 for example, partisan fighters at the port city of Eupatoria in the Crimea assisted a Red Army landing there and revolted against the German occupying forces. Reinforcements were sent in under General Erich von Manstein and the port city was retaken. Reprisals against the partisans were carried out under the direction of Major Riesen, an Abwehr officer on the Eleventh Army’s staff, who oversaw the execution of 1200 civilians, the bulks of whom were Jews. Additional evidence over the duties assigned to Abwehr operatives in theater are revealing. Out in the field, the army group commander of the G-2 was provided assistance for the army group Abwehr officer (Frontaufklaerungskommando III), with additional help coming available from the secret field police. Abwehr officers in this capacity were tasked with overseeing personnel in counterintelligence, the safeguarding of classified information, and preventative security. The Frontaufklaerungskommando III received instructions concerning the Abwehr from OKH/General z.b.V./Gruppe Abwehr, and "informed army group G-2 of all Abwehr matters in a monthly report or special reports." Security within army headquarters was another area of responsibility so detachments of the secret field police were placed at his disposal and he cooperated with particular departments of the SD, the SS, and the police in order to be well versed in all fields of counterintelligence and kept tabs on guards, checking their reliability against available personnel records. According to the United States War Dept. General Staff,
On the whole, it should be stated that the Abwehr was more interested in perpetuating its own interests than it was in saving Jews. While there are certainly accounts of the Abwehr assisting Jews to safety via clandestinely arranged emigration, there are also cases of Abwehr operatives enriching themselves in the process through bribes and other monetary payoffs.
Several examples demonstrate that the loyalty of Abwehr members was anything but completely true, at least for some. In January 1944 for example, American statesman John Foster Dulles revealed his knowledge of a coalescing resistance against the Nazis, an assemblage of intellectuals from military and government circles; his main contact was Abwehr officer, Hans Bernd Gisevius who was stationed in Zurich as the German Vice Consul there. Dulles communicated with the Abwehr concerning their intrigue against Hitler and even attempted discussions about a separate peace, but FDR would have none of it, preferring instead a policy of unconditional surrender for the Nazi government. Thus, machinations against the National Socialists by the Abwehr were considerable in terms of the chain of command, witnessed additionally in the fact that General Oster of the Abwehr remained in regular contact with Dulles. Foreknowledge and penetration of the Abwehr was such that Dulles reported later in February 1944 (before the organization was dissolved) that the Abwehr was going to be absorbed by Himmler’s SD.
But the Abwehr was ineffective overall for several reasons. Much of its intelligence was deemed politically unacceptable to the German leadership. Moreover, it was in direct competition/conflict with SS intelligence activities under Reinhard Heydrich and Walter Schellenberg. The animosity between the SS and Abwehr did not stop there. Many of the Abwehr's operatives—including Canaris himself—were in fact anti-Nazi and were involved in many assassination attempts against Hitler, including the most serious one on July 20, 1944. Canaris even employed Jews in the Abwehr (a good example is the story of the Geographer Paul Borchardt) and used the agency to help a small number of Jews to escape from Germany into Switzerland. Another contributing factor was that by 1941 British code-breakers at Bletchley Park had managed to decipher the Abwehr hand cypher, and all the wireless transmissions of Abwehr field agents were read at Bletchley Park. In early 1942 the Enigma machine code was also broken; thus all secret radio messages were intercepted. An interesting piece of evidence on the atmosphere within the Abwehr is revealed by the post-war interrogation report of Thomas Ludwig (Theodor Levin), an officer at AST Istambul. Levin stated that "With Admiral Canaris one could work with a good conscience ... he would never demand of an Abwehr officer anything which his conscience would forbid him to do. Canaris stressed this at any meeting of Abwehr officers and constantly forbade, in the severest terms, any 'murder organisation' under his command."
The SS continually undermined the Abwehr by putting its officers under investigation, believing them (correctly) to be involved in anti-Hitler plots. The SS also accused Canaris of being defeatist in his intelligence assessments, especially on the Russian campaign. One such briefing reportedly resulted in Hitler seizing Canaris by the lapels, and demanding to know whether the intelligence chief was insinuating that Germany would lose the war. Defeatism was not the only problem the Abwehr faced, competency and proper screening was another.
Following the launch of Operation Barbarossa, a group of White Russians under General Anton Turkul sought asylum in Germany and offered to provide radio intelligence for the Germans and worked with the Abwehr in getting the necessary communication links established. One of the primary radio links was code-named MAX, supposedly located near the Kremlin. MAX was not the intelligence mechanism the Abwehr believed it to be, instead, it was "a creature of the NKGB" , through which information was regularly disseminated concerning Foreign Armies East and Foreign Air Forces East and troop movements. Careful message trafficking and deception operations by the Soviets allowed them to misdirect the Germans and aided in the strategic surprise they enjoyed against Army Group Center in June 1944. Even though the Abwehr no longer existed at this point, the heritage operations connected to MAX gave the Soviet armies an advantage they would not have otherwise possessed and further prove the extent of damage attributable to the Abwehr's incompetence.
On 10 September 1943, the incident which eventually resulted in the dissolution of the Abwehr took place. The incident came to be known as the "Frau Solf Tea Party."
Frau Johanna (or Hanna) Solf was the widow of Dr. Wilhelm Solf, a former Colonial Minister under Kaiser Wilhelm II and ex-Ambassador to Japan. Frau Solf had long been involved in the anti-Nazi intellectual movement in Berlin. Members of her group were known as members of the "Solf Circle." At a tea party hosted by her on 10 September, a new member was included into the circle, a handsome young Swiss doctor named Reckse. It turned out that Dr. Reckse was an agent of the Gestapo (Secret State Police), to which he reported on the tea party, providing several incriminating documents.
The members of the Solf Circle were all rounded up on 12 January 1944. Eventually everyone who was involved in the Solf Circle, except Frau Solf and her daughter (the Countess Lagi Gräfin von Ballestrem), were executed.
One of those executed was Otto Kiep, an official in the Foreign Office, who had friends in the Abwehr, among whom were Erich Vermehren and his wife, the former Countess Elizabeth von Plettenberg, who were stationed as agents in Istanbul. Both were summoned to Berlin by the Gestapo in connection with the Kiep case. Fearing for their lives, they contacted the British and defected.
Hitler had long suspected that the Abwehr had been infiltrated by anti-Nazi defectors and Allied agents, and the defection of Vemehren after the Solf Circle arrests all but confirmed this. It was also mistakenly believed in Berlin that the Vermehrens absconded with the secret codes of the Abwehr and turned them over to the British. That proved to be the last straw for Hitler. Despite the efforts of the Abwehr to shift the blame to the SS or even to the Foreign Ministry, Hitler had had enough of Canaris and he told Himmler so twice. He summoned the chief of the Abwehr for a final interview and accused him of allowing the Abwehr to "fall to bits". Canaris quietly agreed that it was "not surprising", as Germany was losing the war.
Hitler fired Canaris on the spot, and on February 18, 1944, Hitler signed a decree that abolished the Abwehr. Its functions were taken over by the Reichssicherheitshauptamt or RSHA (Reich Main Security Office) and Major General of Police Walter Schellenberg replaced Canaris functionally within the RSHA. This action deprived the German Armed Forces (Wehrmacht) and the anti-Nazi conspirators of an intelligence service of its own and strengthened Himmler's control over the military.
Canaris, by this time a full admiral, was cashiered and given the empty title of Chief of the Office of Commercial and Economic Warfare. He was arrested on 23 July 1944, in the aftermath of the "July 20 Plot" against Hitler and executed shortly before the end of the war, along with Oster, his deputy. The functions of the Abwehr were then fully absorbed by Amt VI, SD-Ausland, a sub-office of the RSHA, which was part of the SS.
Many historians agree that, generally speaking, the Abwehr had a poor reputation for the quality of its work. Some of the Abwehr's less than stellar image and performance was due to the intense rivalry it had with the SS main security office, the RSHA and with the SD. The American historian Robin Winks says that it was, "an abysmal failure, failing to forecast Torch, or Husky, or Overlord." English historian Hugh Trevor-Roper says it was, "rotten with corruption, notoriously inefficient, [and] politically suspect." He adds that it was under the "negligent rule" of Admiral Canaris, who was "more interested in anti-Nazi intrigue than in his official duties." Historian Norman Davies agrees with this observation and avows that Canaris "was anything but a Nazi enthusiast". According to Trevor-Roper, for the first two years of the war it was a "happy parasite" that was "borne along...on the success of the German Army." When the tide turned against the Nazis and the Abwehr was unable to produce the intelligence the leadership demanded, it was merged into the SS in 1944.
This harsh criticism of the Abwehr aside, there were some notable successes of the organization earlier in its existence. Members of the Abwehr were important in helping lay the groundwork (along with the SD) for the Anschluß with Austria and during the annexation of Czechoslovakia; an Abwehr group also aided in the seizure of a strategically important railway tunnel in Polish-Silesia in the final week of August 1939. Historian Walter Goerlitz claimed in his seminal work, History of the German General Staff, 1657-1945, that Canaris and the Abwehr formed the "real centre of military opposition to the regime", a view which many others do not share. Renown military historian John Wheeler-Bennett wrote that the Abwehr "failed conspicuously as a secret intelligence service", that it was "patently and incontestably inefficient" and adds that members of the Abwehr "displayed no great efficiency either as intelligence officers or as conspirators..." Whatever successes the Abwehr enjoyed before the start of the Second World War, there were virtually none once the war began and worse, the Brits successfully ran 19 double agents through the Abwehr which fed them false information, duping the German intelligence service to the very end. Consequently, the Abwehr has a somewhat unfavourable history.
Grams, Grant W.: “Enemies within our bosom, Nazi Sabotage in Canada”, in John Ferris, Jim Keeley, Terry Terriff (eds.) Journal of Military and Strategic Studies, 2012.