U-23 sinks HMS Daring beside convoy HN 12
U-23 approaches convoy HN 12 during the night and fires at one of the destroyers covering the formation. HMS Daring is hit and breaks apart. The U-boat's own war diary describes a convoy of roughly twenty ships protected by destroyers and a submarine, showing that an escort screen can itself present valuable targets to a boat that gets into a favourable firing position. The convoy continues while other escorts search the area. That is an essential part of convoy doctrine: the merchant formation cannot repeatedly stop or scatter each time…
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