How can I heal my units?Is the battle over and your units have been damaged? No problem – they heal automatically over time, one life point at a time. Units that were destroyed in battle do not heal. Their corresponding slot in military building is freed again and you can recruit a new unit there.
You also have a possibility to heal your units in your Army Management screen using Diamonds.You have a chance to resurrect a fallen unit right after a battle, using Diamonds. It can be worthwhile, especially if you've lost "unattached" units that are not from slots in military buildings but obtained through quests or events - a unit that you can't replace otherwise.