The history of weapons and warfare is usually written from the point of view of the battles fought and the tactics used. In naval warfare, in particular, the story of how these weapons were invented, designed and supplied is seldom told. Chris Henry, in this pioneering study, sets the record straight. He describes how, to counter the extraordinary threat posed by the U-boats in the world wars, the Royal Navy responded with weapons that kept open the vital supply routes of the Atlantic Ocean. He also celebrates the remarkable achievements of the engineers and inventors whose inspired work was essential to Britain's survival.