| Tom Berenger | Sgt./Lt./Capt. John Riley |
| Joaquim de Almeida | Cortina |
| Daniela Romo | Marta |
| Mark Moses | Col. Benton Lacy |
| Stuart Graham | Cpl. Kenneally |
| James Gammon | Gen. Zachary Taylor |
| Stephen Tobolowsky | Capt. Gaine |
| Carlos Carrasco | Dominguez |
| Patrick Bergin | Gen. Winfield Scott |
| Don Wycherley | Brian Athlone |
| Jorge Bosso | Col. Maximo Nexor |
| Guy De Saint Cyr | Lasher |
| Luke Hayden | Seamus McDougherty |
| Brett Hool | Army Recruiter |
| Jason Hool | Peter O'Neil, San Patricios Cannoneer |
| Perla De La Rosa | Juno |
| Steve Leone | John Daly |
| Luis Lorenzo | Padre Varga |
| Wolf Muser | Cpl. Schultz |
| Rodolfo de Anda | Gen. Ampudia |
| Roger Cudney | Col. Harney |
| Gregg Fitzgerald | Paddy Noonan |
| Vanessa Bauche | Flor |
| Fernando Elizondo | 2nd Guerilla |
As the war between the United States and Mexico drags on, a band of Irish-American soldiers defects to the Mexican army.
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