Fire Emblem: The Sacred Stones/Prologue: The Fall of Renais

Try using Eirika for the two lesser enemies. She should be able to take them out without dying. After she uses a vulnerary, have her tackle O'Neill.
 * Objective: Defeat all enemies
 * Allies: 2
 * Recruits:
 * Eirika (Automatic)
 * Seth (Automatic)

Boss: O'Neill
Try having Eirika tackle O'Neill. If her HP drops below half on his counter-attack, have Seth rescue her so that she can heal and attack again.