Actually, I'm attempting to use what would probably be as close as possible to barbarian longsword fighting (without the use of a shield, which was also taken from me) because that's how my character is trained, it tended to involve quick and frenzied assaults which favoured overpowering an opponent. Though apparently overpowering your character is impossible, his upper body strength far exceeds Brennus' own if he can keep his sword at bay with one hand while grappling.