I was suprised by a C3 on my way back to base.
I had wasted most of my torps in bad weather and used all my deck gun ammo on trawlers off Norway.
I fired 2 Torps, but with no effect.
I was well within German airspace and only a few hours away from home port so I used all my AA ammo against it. Lots of deck explosions, but no sinking.