After invading and occupying other countries one by one, Hitler sets his sights on Britain and orders a massive air invasion. The Battle of Britain was a military campaign of the Second World War, in which the Royal Air Force defended the United Kingdom against large-scale attacks by Nazi Germany's air force, the Luftwaffe. It has been described as the first major military campaign fought entirely by air forces. Part of the "Command Decisions" series. Please note this title may contain potentially offensive language and mature themes.