One Man's Hero tells the little-known story of the "St. Patrick's Battalion" or "San Patricios," a group of mostly Irish and other immigrants of the Catholic faith who deserted to Mexico after encountering religious and ethnic prejudice in the U.S. Army during the Mexican-American War. The plot centers around the personal story of John Riley, an Irishman who had been a sergeant in the American Army who is commissioned as a captain in the Mexican army and commands the battalion, as he leads his men in battle and struggles with authorities on both sides of the border
Tom Berenger
Captain John Riley
Joaquim de Almeida
Cortina
Daniela Romo
Marta
Mark Moses
Col. Benton Lacy
Stuart Graham
Corporal Kenneally
Gregg Fitzgerald
Paddy Noonan
Don Wycherley
Brian Athlone
Wolf Muser
Cpl. Schultz
Luke Hayden
Seamus McDougherty
Ilia Volok
Daniel Grzbalski
Patrick Bergin
General Winfield Scott
James Gammon
General Zachary Taylor
Carlos Carrasco
Dominguez
Stephen Tobolowsky
Captain Gaine
Dermot Martin
Seamus Fitzgerald
