Game 3816, Westeros map, city of Hellholt, I was attacking in a battle I shouldn't have been able to lose (enemy had 2 units topped by a light cav, I had a full stack with a dread knight and topped by a ghost), got as far as the WAR cloud and had a servor error/no response (error 500 in Chrome, but that's just the server won't respond thing). When I finally got back into the game, the city was still the enemy's, and there was a stack of 6 topped by a ghost sitting where I'd tried to move.
Sucks to lose that battle and stack; what's worse is I'm suspecting my guys have effectively defected.