Seraphim Falls (2007)

Gideon (Pierce Brosnan), a former Union officer, finds himself the prey of a manhunt led by Carver (Liam Neeson), Gideon's Civil-War nemesis. Carver blames Gideon for a horrible war crime and refuses to give up the chase until his vengeance is complete. Gideon, though wounded, manages to stay one step ahead of his pursuers, until he and his mortal enemy meet in a final inevitable showdown.