“1. Attack on U. S. merchant vessels sailing in British or U. S. convoys or independently is authorized in the original operational area which corresponds in its dimensions to the U. S. blockade zone and which does not include the sea-route U. S. to Iceland.” (C-118)
As these orders show, at one date the ships of a particular neutral under certain conditions could be sunk, while those of another could not. The attitude to be adopted toward ships of particular neutrals changed at various times, for Doenitz conducted the U-Boat war against neutrals with cynical opportunism. It all depended on the political relationship of Germany toward a particular country at a particular time whether her ships were sunk or not.
(2) The Orders Concerning Treatment of Survivors. A series of orders led up to the issue of an order which enjoined U-Boat commanders not merely to abstain from rescuing crews and give them no assistance, but deliberately to annihilate them.
Among these preliminary standing orders of the U-Boat Command is Order Number 154, signed by Doenitz:
“Paragraph (e). Do not pick up survivors and take them with you. Do not worry about the merchant-ship’s boats. Weather conditions and distance from land play no part. Have a care only for your own ship and strive only to attain your next success as soon as possible. We must be harsh in this war. The enemy began the war in order to destroy us, so nothing else matters.” (D-642)
In 1942, when the United States entered the war with its enormous ship-building capacity, the change thus brought about necessitated a further adjustment in the methods adopted by the U-Boats. Doenitz accordingly issued an order, which intended not merely the sinking of merchant ships, not merely the abstention from rescue of the crews, but their deliberate extermination.
The course of events is shown by the record of a conversation between Hitler and the Japanese Ambassador, Oshima, (D-423) in the presence of Ribbentrop, on 3 January 1942:
“The Fuehrer, using a map, explains to the Japanese Ambassador the present position of marine warfare in the Atlantic, emphasizing that he considers his most important task is to get the U-Boat warfare going in full swing. The U-Boats are being reorganized. Firstly, he had recalled all U-Boats operating in the Atlantic. As mentioned before, they would now be posted outside United States ports. Later, they would be off Freetown and the larger boats even as far down as Capetown.”
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“After having given further explanations on the map, the Fuehrer pointed out that, however many ships the United States built, one of their main problems would be the lack of personnel. For that reason, even merchant ships would be sunk without warning with the intention of killing as many of the crew as possible. Once it gets around that most of the seamen are lost in the sinkings, the Americans would soon have difficulties in enlisting new people. The training of sea-going personnel takes a very long time. We are fighting for our existence and our attitude cannot be ruled by any humane feelings. For this reason he must give the order that in case foreign seamen could not be taken prisoner, which is not always possible on the sea, U-boats were to surface after torpedoing and shoot up the lifeboats.