Osprey's study of British air defenses during World War II (1939-1945). German daylight raids on Britain began in the summer of 1940. They were expected and the country had been preparing for quite some time. Searchlights were in place, Fighter Command had been expanded, and anti-aircraft guns were being manufactured. It was from these first preparations that Britain developed tactics to counter the many air raids over the following years. This book shows how Britain prepared for air raids in the run up to the war and details all the tactics that were developed during the war to counter the many aerial attacks. Among the defence systems covered are anti-aircraft guns, barrage balloons and the RADAR system.