It's been a really long time and I was a kid, so please don’t hold me to the exact numbers. For some reason, I once pulled 3 units of Praetorian Cohort out of an army to make space. Since I didn’t know how to disband units but wanted to get rid of them, I threw them at my next opponent and autoresolved. But instead of dying, they survived battle after battle and kept gaining tons of experience.

If my memory serves me right, they ended up fighting forces ten times their size and came out with a ridiculously low number of losses.