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The Wolf Pack or “Rudeltaktik” as the Germans called it was made famous by Karl Donitz and was to have a devastating impact on allied shipping. Despite being implemented only after the fall of France, the origins of this idea first dated back to the First World War. During the First World War, the British had defeated the U-boats by introducing the convoy system. This called for the formation of a group of ships to sail together as a group and under the protection of escort warships. Under the convoy system, U-boats could no longer find isolated easy targets scattered all over. The few U-boats who managed to find a convoy had difficulty attacking as it was escorted by antisubmarine vessels.