Where did my Legion Go? Is this supposed to happen?

[BalkanTourist]

You are right, I think it has to do with your general dying. Also, if your army had no moving points after the battle, they couldn't retreat eventhough they routed, so they were all killed. That is my theory. Although, I'll tell you a little story.
In my current Julii campaign, I got invaded in Africa in Thapsus and Carthage by the Egyptians. We've been fighting a horrible war with wins back and forth and devastating the land. I decided to send an army from my homeland deep in their back in Alexandria hoping to open a second front (A D-day of some sort). I did take Alexandria but I've been strugling to keep control of it. Every turn I have to deal with sieges, invading armies that never seem to stop coming and citizen rioting ( I did release 600 Italian peasants that I had brought along with my army from Italy to become colonizers). And then the Plague came and killed many. The same turn I bribed a young and promising Egyptian general (to lead the army to Memphis, while the Roman general stays in Alexandria to prevent revolts), my general in Alexandria dies from the Plague (he was an excelent manager). And as my new general tried to make his way to the city, he got attacked by 500 strong with no moving points left. I was terified. With his death the second front was over and that was a lot of money to fund. I could not retreat. I had 12 men vs 500 - no chance. So I cheated and ran from one corner to the next and ran the clock down. At the end I had a close victory and made it safely to Alexandria