[.86 bug] Units not in city when attack happens.
Not sure how useful this report will be without a way to reproduce the problem, but I had a game changing bug happen several times in the current game I've been playing.
What happened is that about three or four times in the game, I was attacked in a city, where I had several unit stationed. In each case, the archers and mages stationed in the city didn't take part in the defense, and after losing they were left standing outside the city. The first time this happened, I thought I must have accidentally moved them out of the city before I ended my turn, but after it happened a few more times, I realized that something else was going on. I think there is a relationship to having just constructed one of the archer or mage units the turn before, and having just moved into the city, but I am not sure.