Since we have the one turn per year, it would be a bit of a hassle if we had to wait multiple turns to fully recover an army that just survived a battle that was quite chaotic. A lot of things happen in one turn, especially since they cover a year this time around. I could not find anywhere where this was confirmed exactly if it were at all, and have been looking extensively for it. It would be perfect if it were only one turn for an army to fully recover because in reality, it would probably only take a few months maximum to get all the replacements you'd need. Would be nice if armies that were defeated are not allowed to get replacements until they reach a city of their own. So it doesn't get repetitive fighting a big battle with the same enemy general just because he got away with most of his units, even though each unit lost a lot of men.