In 1979, Karslake described the "Breton Redoubt affair" and concluded that all of the people involved knew of the scheme and all had agreed, albeit with little faith in its success, for it to go ahead. Karslake also reviewed the figures given in the official history of equipment recovered during Operation Aerial. Ellis had included equipment loaded onto ships in England but not landed in France in his figures for material recovered during the operation. Ellis recorded the recovery of the 51st (Highland) Division from Le Havre, the 52nd (Lowland) Division from Cherbourg, the 1st Canadian Division from Brest and of the Beauman Division from Cherbourg, in all, with not accounted for. Karslake wrote that some guns may have been on ships sent from England but not unloaded and could not have belonged to the two BEF anti-aircraft brigades south of the Somme; the anti-aircraft brigade protecting the lines-of-communication units and the AASF airfield defence brigade had only them. The 53rd Heavy AA Regiment reached Marseilles with its two heavy and one light batteries but could only load the light anti-aircraft guns, due to a lack of cranes and no "jumbo" derrick on the evacuation ship; the remaining thirteen 3-inch anti-aircraft guns having to be destroyed and left behind.