The Submarine Campaign refers to military operations that utilize submarines to disrupt enemy supply lines and naval forces. This strategy has been employed in various conflicts, notably during World War I and World War II, where submarines targeted merchant ships to weaken the enemy's economy and war effort. Submarines, such as the German U-boat, played a crucial role in these campaigns by conducting stealthy attacks beneath the ocean's surface. The effectiveness of submarine warfare often led to significant changes in naval tactics and strategies, influencing how nations approached maritime conflicts.