Fire Emblem: The Sacred Stones/Chapter 7: Waterside Renvall

Send Neimi and anyone else you want north to kill the pirate and mage and use the ballista. Send the rest of the group east, winding throughout the path. If you brought Seth, use him to take out the ballista and other person in the northeast.

Use someone with a lance to kill Murray, and any ranged characters you brought could help if they can hit and do damage to him.