Reviving a Character
If an unit falls in battle, you have to go to the Camp option from the map.
Here you have to speak to Ain, if the area you're currently at is the number 1 or 2.
If you're at a different area, you have to speak to Wishbone.
Ain/ Wishbone will give 2 options: Save the game is the first and the second is Revive(Training). When you choose this option, Brian and Ain are sent to the prison camp and here you'll have to fight an easy match against a Trooper and 2 Beast masters:
After you beat the map you'll get the died unit back. You'll even gain some money, 20 s, but this is a Chaos battle.