As acting secretary he had also taken part in the so-called Kronrat, the deliberations in 1914, with Kaiser Wilhelm II and Chancellor Theobald von Bethmann Hollweg, in which the decision was taken to support Austria-Hungary after the assassination of Franz Ferdinand, Archduke of Austria at Sarajevo, which ultimately was to lead to the outbreak of war. He later disavowed the name Kronrat since it was the Kaiser's opinion that was decisive in the discussion, but with which Bethmann Hollweg and Zimmermann concurred.
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