Another great book; "The U-Boat War In The Atlantic"

[Fifi]

Originally Posted by John Pancoast

- Every night attack was to be done on the surface. No scope attacks.

Just finished Kretschmer biography, and was surprised about this point too.
But more of the visibility distances at night...he could penetrate convoy surfaced, stand between rows up to 200m to cargos staying invisible...escape escorts quite easily 500m away still invisible!
His favorite tactic was to stand at the rear of convoy, sail up in a row, sink 1 or 2 ships, let the convoy pass his boat until he could sail in other row and rince and repeat!
Many times he didn’t even have to dive for escape. Escorts were almost completely ineffective at this time.
He was just using his U-Boat like a torpedo boat, and was the only one doing like this.
He tried to convert others friends (like Prien and Schepke) to this very successful tactic, but they were not enthusiastic.
Even though it was not recommended tactic, Doenitz was ok with it, as far as results were there.

No need to say it’s not doable in game...unless giving a hard visibility handicap at night to AIs