Lord Dowding was an officer in the Royal Air Force. He served as a fighter pilot and then as commanding officer of No. 16 Squadron during the First World War. During the inter-war years he became Air Officer Commanding Fighting Area, Air Defence of Great Britain and then joined the Air Council as Air Member for Supply and Research. He was Air Officer Commanding RAF Fighter Command during the Battle of Britain, and is generally credited with playing a crucial role in Britain's defence, and hence, the defeat of Adolf Hitler's plan to invade Britain. He was unwillingly replaced in command in November 1940 by Big Wing advocate Sholto Douglas.