Had this happen to me on an early patrol. Came across a convoy near Liverpool. Took out a T2 and a C3 and made a C2 lean some.
The escorts (5 of them, what did I sink, the Queen Mary???) took a dislike to my behaviour, and proceeded to give me a right royal booting
They destroyed my rudder, bow planes, radio, damaged three of my five tubes and a leak in two compartments. My hull integerty wasn't all that great either.
When I surfaced, the only choice I had for a destination was ahead for England or all back for Ireland. Did everything in the book ( and a couple of things that weren't) to try and get home, but no luck.
Had to quit and restart my patrol. Didnt save before getting beat up