Final answer:
U-Boats were successful in their attacks due to their stealth, advanced technology, torpedoes, and wolfpack tactics.
Step-by-step explanation:
U-Boats, short for Unterseeboot, were German submarines used during World War I and World War II. They were successful in their attacks primarily due to their stealth and advanced technology. U-Boats were equipped with torpedoes, which were powerful weapons that could sink enemy ships. They also utilized tactics such as wolfpacks, where multiple U-Boats would attack in coordinated efforts, making it difficult for enemy ships to defend themselves.
Learn more about U-Boats' success in attacks