Bound in Blood casts you as brothers Ray and Thomas McCall, with the game opening as the two are helping to defend an outpost from the invading Northern troops. Serving as a tutorial of sorts, you begin as Ray, learning how to perform his special Concentration Mode shot, and eventually taking down a bridge that's crossing a river. Then you get to play as new character Thomas, getting to grips with his quickdraw Concentration Mode ability and riding horses into battle.
It's a solid opening and one that sets up an exciting story centred on the army's colonel, Barnsby, and his plan to destroy the McCalls. He's not happy that the brothers effectively became deserters after disobeying a direct order, and he wants to make them pay.