What did Germans utilize to sneak attack on enemy ships and wage unrestricted warfare?

Question

Destroyer's
U-boats
Merchant ships
Aircraft carriers

Answer 1

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.

Answer 2

Are you sure

Answer 3

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.