Operation Kiebitz, a failed World War II attempt to free German prisoners of war
In 1943, the German command tried to rescue him (in Operation Kiebitz) but that daring plan failed.
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Kretschmer was also the subject of Operation Kiebitz, an attempt to liberate several U-boat commanders by submarine, from Bowmanville POW camp in Ontario, Canada, which was foiled by the Royal Canadian Navy.