I have only raided two ports succesfully & had one go horribly wrong....
Scapa Flow in a type VIIb in early 40,only bagged an auxilliary cruiser,managed to hit the Nelson but she didn't count as a sinking...shallow water & put 4 eels into the Hood during the same raid,same outcome as Nelson...had to do it to prove I could.
Curacao-1942 in A Type9,easy port with plenty of fat juicy tankers
Not many DD's or ASW trawlers,subnet in main entrance,go deep under the net
Think I pulled 50K tonnage on this missions raid
Freetown-1943......
Possibly the dumbest raid I've attempted,hit a mine field
that was my last harbour raid,sticking to the convoy hunts now