Alvin York is a poor, uneducated young farmer living a humble life with his mother and siblings in rural Tennessee. Struggling with his faith and burdened by life's hardships, he spends much of his time drinking and fighting. A transformative moment comes when Alvin experiences a near-death event, prompting a deep spiritual conversion. He becomes a devout Christian, hoping to live a peaceful life dedicated to farming and family. However, his newfound faith is tested when World War I erupts. Initially opposed to violence, Alvin wrestles with his conscience and the reality of being drafted into the military.

Once in the army, Alvin's natural marksmanship and leadership abilities become apparent during training. Despite his initial objections to war, he commits to his role, driven by a sense of duty and protection for his fellow soldiers. Sent to the front lines in France, Alvin's courage and skill in an intense battle lead him to perform extraordinary feats, barring further interference from enemy forces. His actions not only change the course of the battle but also earn him significant accolades and recognition.