Quote Originally Posted by Ciaran
Well, I apologize, I was refering t the units I´ve used so far, and that are only the catholic ones, and I´m playing on the default (133 spears, 80 swords etc) unit size, so I can´t tell about other settings there, too.
About retraining, I think but do not know for sure, that the unit price is the sum of the per-man-prices, and retraining costs the sum of the men to be retrained times the man-price, so, a unit of spears reduced to one man costs almost the same to retrain as a new spear unit costs.
Unless it's different for my version, the default is 100/60/40/20. I know because I've never changed the actual unit sizes.

On a related subject, if the kings unit loses men during a battle, it always gets replenished. I had one battle in which my King's unit was down to himself. After the battle, he was back up to full (I'm not sure if the game first takes men from other units before creating replenishing any loses, or if the King simply automatically replenishes without any loses to other units. There is no reason to retrain the king, and as one person mentioned, the King seems to automatically get any upgrades.