- Period:
- First World War (1914-1918)
- Rank:
- Captain
- Unit:
- No. 11 Squadron, Royal Flying Corps
- Awarded on:
- October 29th, 1915
On 21st September, 1915, when flying a machine with one machine gun, accompanied by Flight-Serjeant Hargreaves, he sighted a large German biplane with two machine guns 2,000 feet below him. He spiralled down and dived at the enemy, who, having the faster machine, manoeuvred to get him broadside on and then opened heavy fire. Despite this, Captain Rees pressed his attack and apparently succeeded in hitting the enemy's engine, for the machine made a quick turn, glided some distance and finally fell just inside the German lines near Herbecourt.
On 28 July he attacked and drove down a hostile monoplane despite the main spar of his machine having been shot through and the rear spar shattered. On 31 August, accompanied by Flight-Sergeant Hargreaves, he fought a German machine more powerful than his own for three-quarters of an hour, then returned for more ammunition and went out to the attack again, finally bringing the enemy's machine down apparently wrecked.