Hans Oster

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Hans Oster
Bundesarchiv Bild 146-2004-0007, Hans Oster.jpg
Hans Oster in 1939
Birth date 9 August 1887(1887-08-09)
Place of birth Dresden, Kingdom of Saxony, German Empire
Death date 9 April 1945 (aged 57)
Place of death Flossenbürg concentration camp, National Socialist Germany
49°44′06″N 12°21′21″E / 49.734958°N 12.35577°E / 49.734958; 12.35577 (Execution Site of 20 July 1944 Plot (National Socialist Germany Resistance))
Service/branch Abwehr
Years of service
  • 1907–1932/33
  • 1935–1944
Rank Generalmajor
  • World War I
  • World War II

Hans Paul Oster (b. 9 August 1887 in Dresden, Kingdom of Saxony; d. 9 April 1945 it the KL Flossenbürg, Bavaria) was a German officer of the Royal Saxon Army (de), the Imperial German Army, the Reichswehr and the Wehrmacht, at last Generalmajor, deputy head of the Abwehr under Wilhelm Canaris and an opponent of Adolf Hitler and National Socialism. After the failed 1944 July 20 plot, the Gestapo seized the diaries of Admiral Wilhelm Canaris, the head of the Abwehr, in which Oster's long-term anti-National Socialist activities were revealed. In April 1945, he was hanged as a traitor, as was Canaris.


Hans Paul Oster.jpg

Oster entered, after his Abitur at a Gymnasium, the artillery (4. Königlich Sächsisches Feldartillerie-Regiment Nr. 48) in 1907. In World War I, he served with the Reserve-Feld-Artillerie-Regiment Nr. 53 of the 53. Reserve-Division (3. Königlich Sächsische) on the Western Front. On 23 May 1915 he would become regiment adjutant and on 28 November 1916 battery leader (Batterie-Führer). On 15 January 1917 he was commanded to the Generalkommando XXVII. Armeekorps, on 1 March 1917 then commanded to general staff training at the same army corps. On 25 May 1917 he was transfered to the staff of the 23. Infanterie-Division.

After the war, he was thought of well enough to be kept in the reduced Reichswehr, whose officer corps was limited to 4,000 by the Treaty of Versailles. However, he had to resign from the army in 1932, when he got into trouble because of an indiscretion during the Carnival in the demilitarized zone of the Rhineland, where Reichswehr officers were prohibited.

He soon found a job in a new organization which Hermann Göring set up under the Prussian police. He transferred to the Abwehr in October 1933. It was in this connection that he met future conspirators Hans Bernd Gisevius and Arthur Nebe, who were then working in the Gestapo. Oster also became a close confidant of Wilhelm Canaris, the head of the Abwehr.[1]

Opposition to Hitler

Like many other army officers, Oster initially welcomed the National Socialist regime, but his opinion soon soured after the 1934 "Night of the Long Knives", in which the Schutzstaffel (SS) extra-judicially murdered many of the leaders of the rival Sturmabteilung (SA) and their political opponents, including General Kurt von Schleicher, last Chancellor of the Weimar Republic, and Major-General Ferdinand von Bredow, former head of the Abwehr. In 1935, Oster was allowed to re-enlist in the army, but never on the General Staff. By 1938, the Blomberg-Fritsch Affair and Kristallnacht (the alleged state-sanctioned pogrom against Jews in Germany), turned his antipathy into a hatred of National Socialism. In the course of the Fritsch crisis, Oster met General Ludwig Beck, Chief of the General Staff, for the first time.[2]

Oster's position in the Abwehr was invaluable to the conspiracy. The Abwehr could provide false papers and restricted materials, provide cover by disguising conspiratorial activities as intelligence work, link various resistance cells that were otherwise disparate, and supply intelligence to the conspirators. He also played a central role in the first military conspiracy to overthrow Hitler, which was rooted in Hitler's intention to invade Czechoslovakia. In August 1938, Beck spoke openly at a meeting of army generals in Berlin about his opposition to a war with the western powers over Czechoslovakia. When Hitler was informed of this, he demanded and received Beck’s resignation. Beck was highly respected in the army and his removal shocked the officer corps. His successor as Chief of Staff, Franz Halder, remained in touch with him and also with Oster. Privately, he said that he considered Hitler “the incarnation of evil.”[3] During September, plans for a move against Hitler were formulated, involving Field Marshal Erwin von Witzleben, the army commander of the Berlin Military Region, and thus well-placed to stage a coup.

Oster, Gisevius and Schacht urged Halder and Beck to stage an immediate coup against Hitler, but the army generals argued that they could mobilize support among the officer corps for such a step only if Hitler made overt moves towards war. Halder nevertheless asked Oster to draw up plans for a coup. It was eventually agreed that Halder would instigate the coup when Hitler committed an overt step towards war. Therefore, emissaries of the conspirators traveled to Great Britain with assistance of Oster's Abwehr to urge the British to stand firm against Hitler over the Sudeten crisis. On 28 September, however, Prime Minister Neville Chamberlain agreed to a meeting in Munich, at which he accepted the dismemberment of Czechoslovakia. Hitler's diplomatic triumph undermined and demoralized the conspirators. Halder would no longer support a coup. This was the nearest approach to a successful conspiracy against Hitler before the 20 July plot of 1944.

As war again grew more likely in mid-1939, the efforts for a pre-emptive coup were revived. Oster was still in contact with Halder and Witzleben. But many officers, particularly those from Prussian landowning backgrounds, were strongly patriotic and saw a war to regain Danzig and other lost eastern territories from the occupying Poles as justified.

After the outbreak of World War II, resistance in the army became more problematic since it could lead to defeat of Germany. However, when Hitler decided to attack France soon after the Polish campaign in 1939, Halder along with other ranking generals thought it to be hopelessly unrealistic and again entertained the idea of a coup, urged by Oster and Canaris. However, when Hitler vowed to destroy the "spirit of Zossen" (Zossen was where headquarters of the Army High Command was located), by which he meant defeatism, Halder feared that their conspiracy was about to be discovered and destroyed all incriminating documents.

Meanwhile, in an act that even other conspirators would have regarded as treason, Oster informed his friend Bert Sas, the Netherlands' military attaché in Berlin, more than twenty times of the exact date of the repeatedly delayed invasion of the Netherlands. Sas passed the information to his government, but was not believed. Oster calculated that his "treason" could cost the lives of 40,000 German soldiers and wrestled with his decision, but concluded that it was necessary to prevent millions of deaths that would occur in what would be undoubtedly a protracted war should Germany achieve an early victory.[4]

The period between 1940 and 1942 was the nadir of German resistance. Some officers were pleased to be wrong to have feared military disaster. Others still opposed Hitler and the National Socialist regime, but felt that his enormous popularity with the people made any action impossible. Tireless, Oster nevertheless succeeded in rebuilding an effective resistance network. In 1941, when the systematic extermination of European Jews began with the invasion of the Soviet Union, his Abwehr group established contact with Henning von Tresckow's resistance group in Army Group Center. In 1942, his most important recruit was General Friedrich Olbricht, head of the General Army Office headquartered at the Bendlerblock in central Berlin, who controlled an independent system of communications to reserve units all over Germany. Oster's Abwehr group supplied British-made bombs to Tresckow's group for their various attempts to assassinate Hitler in 1943.

However, later in 1943, the Abwehr group's efforts to rescue Jews were discovered by the Gestapo and Oster was dismissed from his post. Hans von Dohnanyi, who joined the Abwehr shortly before the war, and Dietrich Bonhoeffer, the famous Lutheran theologian and Dohnanyi's brother-in-law, helped 14 Jews to flee to Switzerland disguised as Abwehr agents in Operation U-7. Dohnanyi and Bonhoeffer were arrested on charges of alleged breach of monetary exchange laws, amongst others with the leading German insurance brokers Jauch & Hübener, Captain Walter Jauch of the Jauch family, being a first cousin-in-law of Oster, and Otto Hübener later being hanged. Oster was placed under house arrest. Their involvement in the German resistance was discovered after the failure of the 20 July Plot.


Oster was arrested one day after the failed 20 July Plot to assassinate Hitler. On 4 April 1945, the diaries of Admiral Canaris were discovered and, in a rage upon reading them, Hitler ordered that the conspirators be executed.[5]

On 8 April 1945, Oster, Dietrich Bonhoeffer, Wilhelm Canaris, and other anti-National Socialists were convicted and sentenced to death by an SS court-martial presided over by Otto Thorbeck. At dawn the next day, Oster, Bonhoeffer and Canaris were hanged in Flossenbürg.

Fabian von Schlabrendorff, one of the few major coordinators of anti-National Socialist activities to survive the war, described Oster as "a man such as God meant men to be, lucid and serene in mind, imperturbable in danger."[6]


Hans was the son of a pastor of the Huguenots Protestant Church in Dresden. On 20 September 1912, he married his fiancée Gertrud Evelyn Knoop from a family of textile industrialists in Bremen. They had three children:

  • Hans Karl Joachim "Achim" (b. 20 February 1914 in Dresden; d. 2 March 1983 in Dachau), Major i. G. in WWII, at last commanding a tank regiment; later member of the Amt Blank, then the Bundeswehr until 1973, since 1971 two-star major general.
  • Harald Julius Eberhard (b. 12 June 1919 in Dresden; 27 January 1943 in Stalingrad), Oberleutnant of the Heer
  • Maria Barbara (b. 25 February 1921 in Dresden)


  • "He's a man of courage and conviction. And what resolution in his sermons! There should be a handful of such people in all our churches, and at least two handfuls in the Wehrmacht. If there were, Germany would look quite different!" – Oster about Msgr. Clemens August Graf von Galen, Roman Catholic bishop and vocal critic of National Socialism[7]


  • Fahnenjunker: 18 March 1907 (commission/patent from 14 February 1907)
  • Leutnant: 18 August 1908
  • Oberleutnant: 25 September 1914
  • Hauptmann: 16 April 1918 (with rank seniority from 18 April or 22 May 1916)
  • Major: 1 March 1929
    • Voluntary farewell on 31 December 1932 with effect from 31 March 1933 for violating the code of honor (without declaring any dishonor), because he had an affair with the wife of a comrade; permission to wear the uniform in civilian life was granted to him. The reason was an affair with the wife of a reserve officer of his regiment and professor from Trier, although he himself had been married to Gertrud Knoop since 20 September 1912. The court of honor then advised him to take his leave.
    • May 1933 civil employment in the research office of the newly formed Reichsluftfahrtministerium (de)
    • 1 October 1933 he entered the service of the Abwehr of the Reichswehrministerium (de)
  • Major (E or Ergänzungsoffizier): 5 March 1935
  • Oberstleutnant (E): 1 December 1935
  • Oberst (E): 1 April 1939
    • 30 January 1941 Entry into the active officer corps
  • Generalmajor: 16 November 1942 with effect from 1 December 1942
    • April 1943 leave of absence and then on 19 June 1943 Transfer to the reserves (Führerreserve)
    • With effect from 4 March 1944 he was "granted the right to wear the previous uniform" and discharged from active military service

Awards and decorations

Further reading

  • Joachim Fest: Plotting Hitler's Death: The German Resistance to Hitler, 1933–1945 (London, Weidenfeld & Nicholson, 1996).
  • Peter Hoffmann: The History of the German Resistance, 1933–1945 (Montreal, McGill-Queen's University Press, 1996).
  • Terry Parssinen: The Oster Conspiracy of 1938 (London, Harper Collins, 2004).
  • Roger Moorhouse: Killing Hitler (London, Jonathan Cape, 2006).
  • Terry Parssinen: Die vergessene Verschwörung. Hans Oster und der militärische Widerstand gegen Hitler (München, Siedler, 2008).


  1. Michael Balfour, Withstanding Hitler, p160-161
  2. Michael Balfour, Withstanding Hitler, p161
  3. Joachim Fest, Plotting Hitler’s Death: The German Resistance to Hitler 1933–1945, 86
  4. Peter Hoffmann, The history of the German resistance, 1933–1945(p171)
  5. Joachim Fest (1994). Plotting Hitler's Death: The German Resistance to Hitler, 1933-1945. Weidenfield & Nicholson. ISBN 0-297-81774-4. 
  6. William L. Shirer (1960). The Rise and Fall of the Third Reich, 1024. 
  7. Philipp Freiherr von Boeselager, Valkyrie: The Story of the Plot to Kill Hitler, by its Last Member, Vintage Books, 2009. Page 70.