No. 5 Group RAF effective squadrons of Bomber Command, personified by No 617 Squadron the "Dambusters", formed from 5 Group aircrew in March 1943. Most of the group's main airfields were around Lincoln, including RAF Scampton. By the end of the war the group had grown to 15 squadrons. The group was noted for its high accuracy bombing, being involved the sinking of the "Tirpitz" in November 1944 and the shattering of the strategic Bielefeld railway viaduct in March 1945. The Group introduced new weapons operationally, including Barnes Wallis's "bouncing" and his Tallboy and Grand Slam "earthquake" bombs. The group was disbanded on 15
No. 255 Squadron RAF conditions unsuitable for day fighters. This kept the squadron's personnel busy during what a relatively quite period in the air war over England. Entries in the squadron's ORB during this period record mostly "no operational night flying. No enemy aircraft in the Sector." The comment was often suffixed by "...and weather u/s". On 6 June 1942, the squadron moved from RAF High Ercall to RAF Honiley, in Warwickshire, where they rotated with No. 257 Squadron RAF, No. 3010 Echelon and No. 1456 Flight RAF. The move was completed in a single day. From Honiley the squadron continued to fly operational