Last remaining copy!

World War I saw the submarine develop into a potent weapon of war. The German submarine campaign almost defeated Britain during the spring of 1917. By striking at the shipping that supplied her, it has been estimated that Britain came within six weeks of starvation.

Salvation came in two ways. Firstly, the allies adopted the convoy system, forcing the U-boats into encounters with escorting warships, whilst protecting precious cargoes. Secondly, technological innovations, such as the hydrophone, depth charge and mine barrage were added to the arsenal of anti-submarine weaponry. Slowly the tide turned and the U-boat menace was contained.