Quote Originally Posted by player1
Feature or bug?

Units when retrained are fulled with recruits with exp level equal to average of the unit.
So if you have unit with just 6 soliders and 9exp, just retrating them you get full unit with 9exp.

Manual states otherwise that recruits are always of low exp, so can water down good exp unit.
I don't think that's a bug, I think it's a feature.

And the reason I say that is because you pay more to retrain units with experience - a LOT more. I've got some units of militia hoplites in my current game I won't retrain because the game wants me to pay several hundred denarii for 2 or 3 new soldiers.

In fact now I tend to just merge units with high experience so I'm not faced with the expensive business of retraining them.