BTF: Where are the capital ships?

[JerseySeven]

SH5 with TWoS...
I got a mission complete in my second patrol on the East British Coast, and when I was about to start my third, it was 14 October. I know that one can't chose 'Breaking the Fortress' after 15 October, but it was still available when i went to select my next mission.

Enroute, I received none of the usual radio instructions. There was a red 'x' and circle at Scapa Flow, but when I clicked on it, the little window with information was blank.

Well, I sailed on, managed with difficulty to get into the harbor, and there were nothing but about four DD's and about 8-9 merchants, only five of which were worth torpedos.

Was this because the allotted mission time expired when I was on my way there?

Or, perhaps it was that Prien fellow! He must have gotten there before me!