Unit regeneration

After a war with another player you usually end up with several units that are so damaged that end up being useless, so you have to take them back and heal for days or use gold.

I think it would be a good idea to "rebuild" those units in cities where you have an industry to produce them, and you have to pay for it, for example:

Infantry at 30% health

- Has to be regenerated in a city that has a barrack (i don't know if it's called like that in the English version)

- Regeneration time would be 70% (100% - 30%) of the time you need to create a new one

- Cost of regeneration would be 70% of the resources needed to create a new one

I think it's an easier solution than creating a "field hospital" building, plus, you end up paying the cost of your wars