The Kriegsmarine was the navy of Nazi Germany from 1935 until 1945. It played a crucial role during World War II, focusing on submarine warfare and surface fleet operations. The Kriegsmarine aimed to challenge the naval supremacy of the Royal Navy and protect German maritime interests. The fleet included various types of vessels, such as battleships, cruisers, and submarines, known as U-boats. The Kriegsmarine faced significant challenges, particularly after the loss of key battles and resources. Ultimately, it was disbanded after Germany's defeat in 1945, marking the end of its operations.