What was true about Germany's use of U-boats?

Germany's use of U-boats during World War I and World War II was primarily aimed at disrupting Allied shipping and trade routes. These submarines conducted unrestricted warfare, targeting military and civilian vessels alike, which contributed to significant losses in maritime commerce. The effectiveness of U-boats initially led to substantial victories for Germany, but eventually, improved Allied anti-submarine tactics and technologies reduced their impact. This strategy played a crucial role in the naval battles of both wars, highlighting the importance of submarine warfare in modern conflict.