Watch Tirad Pass: The Story of Gen. Gregorio del Pilar for Free: How to Stream the Movie Online at 123Movies. . The Battle of Tirad Pass was fought between Filipino revolutionary forces and Americans of the 33rd Infantry Regiment in Ilocos Sur. Brigadier General Gregorio del Pilar led the Filipinos, while Major Peyton March led the Americans. The battle resulted in the death of Del Pilar, along with 51 Filipino soldiers.