Manuel enlisted in the
43rd Battalion,
Australian Imperial Force on 5 April 1916. He swore that he was a natural born British citizen, that he worked as a farmer, and that his uncle, Frederick George Jones, was his next of kin. Manuel claimed a year's prior militia experience. He transferred to the
Australian Flying Corps on 30 April 1917. He was posted to No. 2 Squadron AFC in France as a
Royal Aircraft Factory SE.5a pilot on 6 February 1918. He scored his first aerial victory on 2 April 1918, in company with Captain
Henry Garnet Forrest; they destroyed a German two-seater reconnaissance machine over
Demuin. Two months later, on 2 June, he destroyed two
Pfalz D.III fighter planes, then drove down a third one out of control within the half hour. Ten days later, on 12 June 1918, he became an ace by setting another Pfalz D.III afire north of
Bussy. His exploits earned him the award of a
Distinguished Flying Cross (DFC) on 2 July 1918. Manuel was then promoted to captain as he was appointed a
Flight Commander. He switched airplanes. He had scored his first five wins in serial number B184; he would use number C1948 for his final seven victories. He began on 22 July 1918, driving down a Pfalz D.III and a
Fokker D.VII, both out of control. On the 31st, he drove down an
Albatros D.V. The destruction of a Fokker D.VII on an evening patrol on 14 August 1918 brought Manuel's total to nine wins. British military intelligence later exhumed this German pilot's body to examine the
parachute he was wearing. ==Post-war==