The Iron Major (1990)

In this biopic, Frank "Cav" Cavanaugh (Pat O'Brien) finds his family in a financial bind and quits Dartmouth, where he was a football star, to take a coaching job at another school. Soon, he meets and marries Florence (Ruth Warrick), and ends up coaching the Dartmouth team. But with World War I under way, Cav enlists, leaving behind his growing family. In Europe, he rallies the men under his command, but, after he's hurt on the battlefield, Cav comes home and football beckons again.