In November 1939 Krech returned to the Kriegsmarine and began U-boat training. He received his first combat experience as 1st Watch Officer (IWO) on U-100 under Kptlt. Schepke. He left the boat in November 1940 and after Commander training with the 24th Flotilla he commissioned U-558 in 1941. Günther Krech returning from patrol More @Wikipedia
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