Quote Originally Posted by BerkeleyBoi
But when you retrain your unit, there is no experience loss (a unit with 4 units with 3 gold chevs retrained will be a full unit with 3 gold chevs). if each individual soldier has their own exp, why is this true?
It drops, but not always. I have just retrained 18 men strong unit of Hipp Thessalikoi with one silver and it dropped to 2 bronze

If you have super experienced unit it may have much more exp than needed for 3 gold, so even few men could bring the level up, especially if you retrained them in city giving some exp bonus