The U-Boat Campaign refers to the naval warfare strategy employed by Germany during both World Wars, primarily using submarines known as U-boats. These submarines targeted military and merchant ships in an effort to disrupt supply lines and weaken enemy economies. The campaign aimed to cut off resources and support to the Allied Powers. In World War I, the U-Boat Campaign led to significant losses for the Allies, prompting the introduction of convoy systems for protection. In World War II, the campaign intensified, with U-boats sinking thousands of ships. Ultimately, advancements in anti-submarine warfare contributed to the decline of the U-Boat threat.