Mauduit was a cadet at Sandhurst when the
European War broke out. On 15 August 1914 he was commissioned as a
second lieutenant in the
7th (Princess Royal's) Dragoon Guards. On 17 May 1915 he was promoted to temporary lieutenant; he was confirmed in this rank on 9 August. After completing his flying training he was granted
Royal Aero Club Aviators Certificate No. 4271 on 24 February 1917, after flying the
L & P Biplane at the London & Provincial School at
Hendon Aerodrome. and posted to No. 11 Squadron to fly the
Bristol F.2 two-seater fighter. His victory string began on 12 July 1917 when he, with observer Lieutenant E. R. Dibbs, drove down out of control an
Albatros D.V over
Pelves. He and Dibbs repeated the feat on 20 July over Novelles. On 14 August he forced down another D.V over
Brebières with Corporal
Jack Mason, and another over
Dury on 10 September with observer Lieutenant C. C. Dennis. On 17 October he gained a double victory over the
Sensée Canal–
Cambrai, driving down two more D.Vs with observer Lieutenant Leslie McRobert. Finally, on 21 October, Mauduit was paired with Corporal Mason again when he accounted for three more D.Vs over
Boiry–
Lécluse, driving down one, destroying a second, and shooting down the third in flames. On 4 February 1918 Mauduit was awarded the
Military Cross, which was
gazetted on 2 July. His citation read: :Lieutenant Ronald Frank Strickland Mauduit, Dragoon Guards and Royal Flying Corps. ::"For conspicuous gallantry and devotion to duty. He carried out a most valuable single machine reconnaissance at a height of 500 feet, searching enemy roads and railways and obtaining important information. On another occasion, while on a photographic reconnaissance, he encountered twenty hostile scouts and drove down two of them out of control. He has destroyed ten enemy machines, and shown the greatest determination at his work." ==Post-war==