Yes when you read what happened historically during that period, like irish said, after a few successes in the begining of 1943, it goes downhill pretty fast from there and gets really ugly.
Almost all the escort groups have a jeep carrier with them, the Allied organize bait convoys to draw the U-boats and then trap them, I think there was one case where there were 21 escorts protecting a convoy or waiting for U-boats to fall into the trap. Also it is around that time they have these nasty Bay of Biscay aircraft ASW patrols or offensives and the U-boats barely manage to do any significant sinkings and suffer huge losses. At one point, probably summer 1943, they have say 18 U-boats sailing out of the french harbours and 13 get sunk byaircrafts.
So yes it is around that time that it becomes really nasty.
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