 The superiority of concentrated forces using maneuver warfare in the hypothetical example carried the proviso of "all other things being equal"; by 1944 things were far from being equal.With Allied air superiority not only were major force concentrations vulnerable to tactical and heavy bombers themselves, but so were the vital assets—bridges, marshalling yards, fuel depots, etc.—needed to give them mobility.As it was in this case, the blitzkrieg solution was the worst of both worlds, neither being far enough forward to maximise the use of their defensive fortifications, nor far enough away and concentrated to give it room to manoeuvre.