Win condition: Rout the enemy
This time you're up against more brigands, and a prisoner (the recruitable character Silque) who needs to be saved.
Immediately take out the enemy archer by swarming him with Alm and Lukas. From there, simply defeat the brigands one by one as you did in the prior battle. Lead with strong units, and finish off foes with weaker units that need experience.
When you reach the enemy commander, heal up by eating food and send in a strong unit to square with him one on one, winning the battle and clearing the map.
