This series deals with operational analyses of the principal operations in North-west France following the D-Day landings in which heavy bomber forces were deployed in a tactical role in close support of ground forces. Solly Zuckerman had supported the view of Air Chief Marshal Leigh-Mallory, Commander in Chief of the Allied Expeditionary Air Force (AEAF), that heavy bombers had the capacity to provide tactical support to ground forces in their post D-Day advance.
The investigations were conducted during late July and August 1944 for the most part, spanning the phase between the planning and execution of Operation Overlord (covered by Series SZ/AEAF) and the establishment of the RAF Bombing Analysis Unit in the early autumn of 1944 (this unit is the subject of Series SZ/BAU).
The studies were based on attack data such as operational orders, signals, maps, air reconnaissance photographs and their associated interpretation reports, ground investigations of the target areas, and interviews with eye-witnesses including German prisoners-of-war - all of which are preserved in the files.