After passing out as a "Gentlemen Cadet" from the Royal Military College, Sandhurst, Hudson was commissioned as a second lieutenant in the Buffs on 15 September 1915. He was immediately seconded to the Royal Flying Corps, being granted Royal Aero Club Aviators' Certificate No. 1830 on 6 October, after flying a Maurice Farman biplane at the Military Flying School at Farnborough, and was appointed a flying officer on 10 November. Assigned to No. 15 Squadron, Hudson was wounded in action on 21 February 1916, and was subsequently awarded the Military Cross on 30 March. His citation read: After recovering from his injuries, Hudson eventually returned to active duty in No. 54 Squadron, flying the Sopwith Pup. He gained his first victory by sending an enemy reconnaissance aircraftdown in flames over Courcelette on 27 January 1917, and drove down another on 13 February. On 4 March he was appointed a flight commander with the acting-rank of captain. On 5 April, Hudson, with Captain R. G. H. Pixley, Lieutenant Maurice Scott and 2nd LieutenantReginald Charley, shared in the destruction of an observation balloon at Gouy. Hudson went on to drive down two more enemy aircraft in that month. He had been promoted to temporary lieutenant on 1 February, but had to wait until 1 July until it was made permanent. He gained his sixth and final victory by destroying an Albatros C on 11 July. Two days later, on 13 July, Hudson was shot down between Bruges and Ostend by aircraft from Jasta 20. Initially reported as missing, it was not until September his father, Frank Hudson, of Park Langley, Beckenham, received notification that his son was unwounded and a prisoner of war at Karlsruhe. Hudson remained a POW until after the armistice in November 1918, and in December 1919 received a mention in despatches "for valuable services whilst in captivity".
Post war
On 1 August 1919 Hudson was granted a permanent commission as a lieutenant in the Royal Air Force, relinquishing his Army commission in the Buffs the same day. On 1 January 1921 he was promoted from flying officer to flight lieutenant. He was transferred from the RAF Cadet College at Cranwell to No. 6 Squadron, based in Iraq, on 24 February 1922. On 31 May 1922 he crashed his Bristol F2b on landing, and died from his injuries on 6 June. He is buried in Ma'asker Al Raschid RAF Cemetery just outside Baghdad.
