In the early 1920s, the British Admiralty declassified documents stating that, despite all efforts, the British shipbuilding industry was unable to cover the losses of shipping space caused by Kaiser submarines, and that it would not have recovered them until 1921 at best. Captain Karl Dönitz carefully released from captivity, and after becoming commander of the U-Bootwaffe on September 1, 1939, applied the strategy created on this fact when deploying U-boots in the Battle of the Atlantic. It was estimated that bringing the United Kingdom to its knees would require monthly losses of around 500,000 GRT.
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