This is the first comprehensive history of the Scottish air defence system during the Second World War. It examines how radar stations, Royal Observer Corps posts and command centres worked together to detect and respond to approaching enemy aircraft. Going beyond the well-known events of the Battle of Britain, the book traces the development of the Scottish air defence network throughout the war, highlighting advances in technology and tactics. For the first time, the role of gun control rooms under the command of the Air Defence Command is also included in the overall narrative. Detailed accounts of each operations centre and a complete list of Royal Observer Corps posts throughout Scotland enable local research into the contributions of individual communities. Based on eyewitness accounts and rare wartime photographs many of which have never been published before this book offers valuable insights for aviation, military and local historians, as well as anyone interested in Scotland's wartime experiences.