In 1919 Saundby received a permanent commission into the
Royal Air Force (RAF). This period also saw him taking the
sea plane course at
Lee-on-Solent, studying at the RAF and Naval Cooperation School at
Calshot and being awarded the
Air Force Cross. April 1922 was Saundby's first flight to
Baghdad. In February, March, November and December 1923 he participated in bombing operations. He moved on to become an instructor in Egypt with No. 4 Flying Training School at
Abu Sueir, Egypt. However, this lasted for only two months when he was given command of the
Aden Flight. This was due to a sudden illness affecting the sitting commander. Saudby initially disliked the posting but grew to appreciate the experience. It proved to be the only command of his career. Saundby's move towards the upper command ranks of the RAF was initiated when he joined No. 58 Squadron as a Flight Commander on 15 October 1926. With the squadron he flew the
Vickers Virginia and
Vickers Victoria aircraft at
RAF Worthy Down. His squadron commander was Wing Commander Arthur Harris, and the squadron concentrated on developing night bombing techniques such as
target-marking in their 70 mph machines. The other squadron at Worthy Down at the time, No. 7, was commanded by Wing Commander
Charles Portal, later to become Chief of Air Staff during the
Second World War and the direct superior and sometimes opponent of Harris. In 1927–28 Saundby attended the
RAF Staff College before being posted to the
Wessex bombing area staff. By this period he had logged over 2000 flying hours, however his flying career was drawing to a close as he rose into more staff positions. At the rank of
wing commander, Saundby attended the
Imperial Defence College in 1933. He also worked for two years at the RAF
Staff College, Andover as an instructor. In 1937, Saundby was appointed Deputy Director of Operations. From there he became Deputy Director (and subsequently Director) of Operational Requirements and Assistant Chief of Staff (Operational Requirements and Tactics). He held these posts between 1938 and 1940, also rising to
Air Vice-Marshall in this period. ==Second World War==