Formed as a light bomber unit of the Auxiliary Air Force in October 1925, it was at the height of the Battle of Britain the Commanding Officer of RAF Hornchurch, Group Captain Boy Bouchier described 603 as perhaps the greatest squadron of them all. The Squadron has enjoyed prestigious and distinguished service second to none. This extensive history details the 603 story through the early years with its colourful characters, through the Phoney War and into the Battle of Britain. Here, pen portraits and narrative tell of acts of bravery, heroism and loyalty to the cause by pilots and ground crew alike. It was a tight-knit squadron and the loss of personnel was felt deeply. The authors have included an extensive collection of documents and photographs in the text.