I had a unit of spears (150 men) upgraded and after the battle it was reduced to 139 men. As they had the small shield icon I thought that I could use some men from a unit that wasn't upgraded to refill it, supposing that the 11 men would automatically get the upgrade. And I made a save here.
After doing so I sent the unit inside the settlement with the armor upgrading building (the same that upgraded the unit) and the unit I just refilled was available for conversion at the cost of 4 florins. This makes me think that each men in a unit has its personal stats recorded so the 4F are for the upgrading of 11 men.
I didn't test it to see if the men on the battlefield all had the same armor in the same unit (I remember I did some time before and but I'm not sure)
I reloaded the save I made after refilling the upgraded unit and something strange happened : the shield icon disappeared. The entire unit lost it's upgrade ?
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