Fire Emblem: Path of Radiance/Chapter 1: The Battle Begins
You get your first mission as one of the Greil mercenaries and it's to defeat a couple of bandits in a small nearby village. Ike, Titania, Oscar and Boyd are those chosen to carry it out. These four head off to battle the bandits while Greil, Shinon and Gatrie handle the other requests.
The aim of this level is to seize the northernmost house. To begin, move Ike into the bottom-right hand corner. Then move Titania in front of the nearby door and select the visit command to collect a steel sword, then move her so that she is two squares left of the western fighter. Then use Boyd to fight the fighter just past the fence and near the southwest house, then Oscar should be used to fight the other nearby fighter. Once this battle is finished, move Oscar so that he is one square above Boyd. This opening is so that neither Boyd nor Ike gets attacked by the fighter Oscar attacked in this turn.
During your next turn, continue Boyd's battle and finish off Oscar's foe from turn one. Move Oscar towards the northwest house after that fighter's dead. Now, Ike needs to make his way up towards the boss. During turn 3, visit the northwest house with Oscar and fight off the western myrmidon and bandit with the help of Titania. Now use Ike to deal with the northeastern enemies during the next few turns with Titania and Boyd to help speed things up. Once these enemies are killed, kill the boss with Titania and seize the target square with Ike.