129 was first created in the latter months of the First World War as a day bomber unit based at RAF Duxford.

[1] The squadron returned south in February 1943 undertaking anti-shipping and escort missions.

129 Squadron became part of the 2nd Tactical Air Force in June 1943 converting to the P-51 Mustang in April 1944 in time for Operation Overlord.

After forming part of the 133 (Polish) Wing for D-Day the squadron returned to RAF Brenzett where it undertook anti V-1 activities.

[1] With a move to East Anglia in late 1944 the squadron provided long range fighter cover for RAF Bomber Commands daylight raids.