The Germans utilized U-boats (also known as submarines) to sneak attack on enemy ships and wage unrestricted warfare during World War I and World War II.
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Apologies for the confusion in my previous response. The Germans predominantly utilized U-boats (submarines) for sneak attacks and unrestricted warfare during World War I and World War II. While other naval vessels such as destroyers and merchant ships were employed, U-boats played a significant role in German naval strategy during those conflicts. Aircraft carriers, on the other hand, were not extensively used by the Germans in World War II.
