I found a convoy of merchants.
I stalked them.
I quickly found that they had an escort.
We were going head on, me attacking the merchants, him attacking me.
I dived to periscope depth and fired a torpedo at it.
It hit him dead on and broke of the front of his ship.
I surfaced and resumed attacking the merchants.
He was still attacking me somehow though he was almost vertical
Eventually he sank.
Randomly a merchant I thought was unarmed started shooting at me.
I sank him with my deck gun.
Again random shooting.
This time I used a torpedo also.
Eventually I had no torpedoes and not ammo so I dived and left.
Quite actiony