The allied Bolivian–Peruvian Army led by Santa Cruz, with the support of militias from Iquicha led by Antonio Huachaca successfully fought the allied forces of Salaverry and Agustín Gamarra, achieving its goal of establishing a Confederate state consisting of a Peruvian and Bolivian state.

This intervention responded to requests from Peruvian President Luis José de Orbegoso to defeat the parallel government of Felipe Salaverry.

The Bolivian president, Andrés de Santa Cruz, initially collaborated by providing weapons and ammunition to the troops loyal to Orbegoso.

Later Santa Cruz, in command of the Bolivian Army, decided to carry out an armed intervention by entering Peruvian territory through the southern front.

Upon entering Peru, Orbegoso designated Santa Cruz as Superior Chief of the United Army.