I downloaded GWX earlier today(took like 10 minutes with my connection

) I finally get around to installing it this afternoon and go to play. Choose the 7th/13th Flotilla, upgrade my hydrophone and fill in my crew slots. I finally depart from my base the second day after the game starts, in 1939. I get orders to patrol a sector thats nearby. I have 3 points on my map that say there are targets there. So I head to them, to find 2 ships at each one. They have the British flags, but they're showing up as green. Ignoring this I sink them anyways, plus two ships that were leaving the area. I sink up to 20-30 tons. Happy with my work I start to return to my base, which is about an hour away. When my watch reports two more ships, I check and see that they're British and sink them with my deck gun. But unlike the other 8 ships I sank, they didn't show up in my log and the ship sunk icon didn't appear. I continue on my way to my dock. About 10 minutes away from the actual dock part, I realize that I'm taking damage. I check to see that I didn't hit anything, but thats not the case. I slow down time compression to 1 and realize I'm being fired on. Before I can finally come to realization that its a German boat attacking me, I'm sunk.

What did I do wrong to be attacked?