Sergeant York is a biographical film that tells the story of Alvin York, a Tennessee native who is known for his remarkable bravery during World War I. The movie begins by introducing the rough and tumble world in which York lives, as he enjoys drinking, fighting, and generally raising hell with his fellows. Despite his wild ways, it is clear that York has a deep faith and reverence for God, which comes into conflict with his desire to continue his reckless lifestyle.
York's life is turned upside down when he falls in love with Gracie Williams, a devoutly religious woman who challenges him to think seriously about his actions and his future. Through Gracie's influence, York begins to attend church and take his faith more seriously. Eventually, he comes to the conclusion that killing is wrong, even in times of war, and becomes a conscientious objector.
However, when the United States enters World War I, York is drafted into service. Despite his objections, he decides to go, believing that he can do more to protect his fellow soldiers by serving than by staying home. Once in uniform, York struggles with the idea of killing, but eventually comes to the realization that he can use his sharpshooting skills to take out enemy soldiers without actually killing them.
York's bravery and skill are put to the test when he leads a group of soldiers on a mission to take out a German machine gun nest. Though vastly outnumbered and outgunned, York and his men manage to capture more than 130 enemy soldiers, earning York the Medal of Honor and making him a national hero.
Throughout the film, York's deep faith is contrasted with the violence and chaos of war, highlighting the moral and ethical dilemmas that soldiers face in times of conflict. The movie also explores York's personal transformation from a wild and reckless ruffian to a respected and revered hero, highlighting the power of personal growth and redemption.