Summers was commissioned as a temporary second lieutenant on 25 January 1915,[REF] and served in the 13th Battalion, Royal Warwickshire Regiment, until transferred to the General List on 30 April[REF] to serve in the Royal Flying Corps.
He was promoted to lieutenant on 1 July 1916,[REF] and appointed a flight commander with the acting-rank of captain on 8 March 1917 [REF].