Bug report as requested.
Last turn, I logged in to check out the situation. I saw a message from Garesch indicating that he had attacked a Valk stack on the bridge. Was curious why I couldn't see it. Sent a heavy cavalry up onto the bridge to check it out, but still couldn't see it. Sent a message to the team asking what was going on, and went to work. My computer was probably still logged on while I was away. Believed I had multiple days left to finish the turn. Came back in the evening to find that the other team was going, and had taken two or more of my cities.