As part of the combined Bolivian-Peruvian Allied Army, the Bolivian Colorados contributed their hard work to bring victory to the combined armies, at the cost of many lives. The Colorados were in action in some of the great battles of the war, including the Battle of San Francisco (also known as "Battle of Dolores") where the "Camarones betrayal" happened, and the Battle of Tacna, where it was listed and then renamed as the "1st Alliance Infantry Battalion", now part of the forces under the new army chief President Narciso Campero. Most of the time however, before the fighting in Tacna, it was always on the reserve, due to the belated formations of infantry battalions.