Better check your history books. The 322nd BG (M) started combat operations with the 8th AF in early May 1943.
By the time of the massive Regensburg-Schweinfurt raid on August 17, 1943 there were 4 Bomb Groups flying the B-26 in operation with the 8th AF.
They "regularly" flew missions into France and as diversions for the big B-17 raids starting in July 1943.
8th AF B-26 Groups........Started Combat Ops
---------------------------------------------------------
322nd BG (M).................May 1943
323rd BG (M)..................July 1943
386th BG (M)..................July 1943
387th BG (M)..................August 1943
In October 1943 all A-20 and B-26 units in the 8th AF were transfered to the 9th AF also operating from England for Tactical Operations while the 8th AF would concentrate on the Strategic targets.