Summers was commissioned as a temporary second lieutenant on 25 January 1915, and served in the 13th Battalion, Royal Warwickshire Regiment, until transferred to the General List on 30 April to serve in the Royal Flying Corps. As an observer he served in No. 3 Squadron RFC, and later trained as a pilot. Summers was awarded Royal Aero Club Aviators' Certificate No. 2154 on 13 December 1915, after soloing a Maurice Farman biplane at the Military School at Birmingham. On completing his training he was appointed a flying officer on 29 February 1916. He was promoted to lieutenant on 1 July 1916, and appointed a flight commander with the acting-rank of captain on 8 March 1917. On 9 April 1917 he received a mention in despatches for "distinguished and gallant services and devotion to duty" from Field-Marshal Douglas Haig, the Commander-in-Chief of the British Armies in France, and on 18 July 1917 was awarded the Military Cross. His citation read: In June 1918, Summers was posted to No. 209 Squadron RAF, to fly the Sopwith Camel single seat fighter. Between 23 June and 11 August he accounted for eight enemy aircraft; four destroyed, three driven down out of control, and one shared capture. However, on 12 August 1918 his aircraft was shot down by Lothar von Richthofen of Jasta 11, and Summers was taken prisoner. He was held as a POW until after the armistice, finally being repatriated in December 1918.
List of aerial victories
Inter-war career
Summers remained in the RAF post-war, being awarded a permanent commission with the rank of flight lieutenant on 1 August 1919. He served as an instructor, moving from No. 2 Flying Training School to No. 5 Flying Training School on 18 January 1922, then serving at the Central Flying School between 13 March and 1 July 1922, before returning to No. 5 FTS. On 14 September 1923 he was posted to No. 45 Squadron, based in Iraq, receiving promotion to squadron leader on 1 July 1925. On 18 January 1927 he was transferred to No. 70 Squadron, Iraq, then to No. 47 Squadron, Egypt, on 14 February 1927, then returning to No. 45 Squadron, now based in Egypt, on 25 April 1927. He returned to the UK when posted to the Headquarters of the Air Defence of Great Britain at Uxbridge on 23 December 1928. On 1 January 1933 Summers was promoted to wing commander. He published a book Practical Air Navigation Simply Explained in 1935, and served as commander of the School of Air Navigation at RAF Manston up to 1 October 1936. He was promoted to group captain on 1 January 1938, serving on the staff of Bomber Command as head of the navigation section.
