Archibald started his Operational flying from RAF Elsham Wolds near Scunthorpe. 576 Squadron was then based there with103 Squadron. 576 Squadron was formed from 103 and 101 Squadrons at Elsham as part of No1 Groups expansion on 25th November 1943.
His first Operation was on the evening of 12 July 1944 to the French town of Revigny flying in Avro Lancaster LM 439 J2. the crew were Sgt N Mason Flight Enginner. F/O JR Jones Navigator. Flt/Sgt GG Henville Bomb Aimer (Australian) . Sgt SA Johnstone Wireless Operator. Sgt H Walton Mid Upper Gunner and Sgt J Thresh Rear Gunner.
The 30th Operation was on 23 September 1944 to Neuss in Avro Lancaster LM594 A-Able 2. This Lancaster was one of four Centurions on the Squadrons Order of Battle having completed 109 Operations. Archibald and the crew flew 18 times out of their 30 Operations in this Lancaster.
Promoted Pilot Officer in early 1945 and awarded the DFC on 20 February 1945 it appears Archibald continued in the RAF and was promoted Flying Officer (War Subs) on 28th February 1946.