Movie "Unbroken" is about the amazing story of Louis Zamperini (http://en.wikipedia.org/wiki/Louis_Zamperini) who was able to forgive (by God's grace) his former captors/enemies who gravely tortured him in prison!
"Zamperini survived the war, married Cynthia Applewhite, but was constantly haunted with nightmares from his time in the prison camp. Falling into alcoholism, his marriage was on the verge of ending, until his wife became a born-again Christian at a Billy Graham crusade. Through her prodding, she convinced Zamperini to attend the crusade where an internal struggle eventually broke him and brought him to his knees at the cross of Christ. Through his relationship with Christ, he was able to forgive his captors and tormentors."