If a Unit ends its turn in one of your
own cities by pressing the STOP button, the
unit will be repaired if it is damaged. A message will be displayed
that tells you how long repairing that unit will take. You can
stop repairing a unit every turn and continue later.
You should consider that all units in a city will be lost if the
city is conquered. Watch for enemy units approaching your city while
you have units under repair!