Had a situation in a PBEM of the 4 Emperors scenario where the Vit player attacked me (Otho) at Vienna (which I owned). He soundly smashed me with 4:1 odds in the first attack, but then got stuck in what seems to be an endless cycle of auto-garrisons populating on my end. He'd completely annihilate one auto-garrison, then another would muster, he'd beat that, so on and so on.
He initially had about 40K men, but by the time the turn was done, over half were slaughtered by endless fights agianst garrisons, and I still held the city at the end of the turn!
This definitely seems bugged. Can anyone explain what's going on here?