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

Prologue: The Fall of Renais
	Objective	Defeat all enemies		Units Allowed
	New Members			2 (Seth and Eirika only)
	Boss: O'Neill
		Class	Fighter	STR	6	DEF	2
		Level	4	Skill	4	RES	0
		HP	23	SPD	7	Move	5
		Weapon	Iron Axe	Luck	0	CON	11

Defeat all enemies

Try using Eirika for the two lesser enemies. She should be able to take them out without dying if you wait for them to attack you. After she uses a vulnerary if nessessary, have her tackle O'Neill.

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.