The Templar Death, Shaken not Stirred

Harry is involved in a temporal incident during a skirmish with Voldemort at Privet Drive. For him, a decade later, with new allies and a love, he returns on the Autumn Equinox a few months later, a powerful mage with a dislike of those corrupted by dark magic and abilites to kill a Dark Lord. How does a man who wants nothing more than peace struggle through brutal, bloody battles?