Fire Emblem: Path of Radiance/Prologue: Mercenaries

The story begins with Ike and Greil fighting in a forest, they are spotted by Mist who comes running down to meet them. Greil is distracted by mist and ike attacks him during this moment. His attack is dodged and counter-attacked leaving Ike unconscious. When he wakes he wishes to continue training with his father who agrees to continue. At this point Boyd shows up and Greil asks if Boyd can be Ike's sparring partner, Boyd accepts and Ike begins his training. After defeating both Boyd and his father, he is accepted into the Greil mercenaries.

Walkthrough
You begin to battle Boyd. Move Ike 6 squares to the right and end your turn, Boyd will start getting impatiant and you shall begin your next turn. Move Ike so he is next to Boyd and select the attack command, do this again on your next turn and Boyd is defeated.

Griel is much stronger than Boyd and moves and attacks you on his own. Move Ike next to him but don't attack, instead use the vulnerary mist gave you to fully heal yourself. Greil will attack you in his turn and you'll both receive a little damage, attack Griel again in your second turn.