U Boote deutsche. Graue Wölfe Deniz. Серые волки Дёница

, Kriegsmarine UBoot Single, submarines attacking convoys were eventually sunk, the losses of merchant ships were significantly reduced, and the German submarine war collapsed. , Karl Doenitz, who was a, submariner in world war I and became first commander of the 1st, uboat flotilla and then commander of the, Kriegsmarine, uboat forces, carefully studied the problems of German uboats in the, WWI during the interwar years and developed his own tactics of, uboat warfare, called the , Wolfpack tactics.