Showing Attack and Sink!: The Battle for Convoy SC42 by Bernard Edwards
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'This convoy must not get through - U-boats pursue, attack and sink.' This was the signal that Admiral Donitz sent to the commanders of the 21 U-boats of the Markgraf wolf-pack on 9 September 1941 just before the US entered the war. Sixty-three merchant ships were strung out in 12 columns abreast, covering 25 miles of inhospitable ocean.