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Among the war-crimes charges, Dönitz was accused of waging unrestricted submarine warfare for issuing War Order No. 154 in 1939, and another similar order after the Laconia incident in 1942, not to rescue survivors from ships attacked by submarine. By issuing these two orders, he was found guilty of causing Germany to be in breach of the Second London Naval Treaty of 1936[4]. However, as evidence of similar conduct by the Allies was presented at his trial, and with the help of his lawyer Otto Kranzbühler, his sentence was not assessed on the grounds of this breach of international law[4].
On the specific war crimes charge of ordering unrestricted submarine warfare Dönitz was found "[not] guilty for his conduct of submarine warfare against British armed merchant ships", because they were often armed and equipped with radios which they used to notify the Admiralty of attack[4][22] but the judges found that "Dönitz is charged with waging unrestricted submarine warfare contrary to the Naval Protocol of 1936 to which Germany acceded, and which reaffirmed the rules of submarine warfare laid down in the London Naval Agreement of 1930... The order of Dönitz to sink neutral ships without warning when found within these zones was, therefore, in the opinion of the Tribunal, violation of the Protocol... The orders, then, prove Dönitz is guilty of a violation of the Protocol... the sentence of Dönitz is not assessed on the ground of his breaches of the international law of submarine warfare."[4][23]
His sentence on unrestricted submarine warfare was not assessed, because of similar actions by the Allies. In particular, the British Admiralty on 8 May 1940 had ordered that all vessels in the Skagerrak should be sunk on sight; and the statement by Admiral Chester Nimitz, wartime commander-in-chief of the U.S. Pacific Fleet, that the U.S. Navy had waged unrestricted submarine warfare in the Pacific from the day the U.S. entered the war. Thus although Dönitz's was found guilty of waging unrestricted submarine warfare against unarmed neutral shipping by ordering all ships in designated areas in international waters to be sunk without warning, no additional prison time was added to his sentence for this crime[4].