This major new history documents the German invasion of Norway, focusing on the events at sea. The first operation in which the air force, army, and navy worked closely together, Operation Weserübung included the first dive-bomber attack to sink a major warship and the first carrier task-force operations. Based on primary sources from British, German, and Norwegian archives, the book gives a balanced account of the reasons behind the invasion and showcases an unrivalled collection of photographs. As the definitive study of Germany's first and last major seaborne invasion, it offers a close look at an important but often neglected aspect of World War II.