[1] The following year, 1863, Carrera invaded El Salvador and captured and devastated the local populations of Ahuachapán, Chalchuapa, and Santa Ana.

A trench with defensive positions was also built on a hill near the Santa Ana Volcano with 150 men stationed there.

At around 1 in the afternoon, the Guatemalans attempted a last attack to dislodge the Salvadorans, but a company under the command of Estanislao Pérez defeated them.

General Santiago González and his division left their positions and attacked the Guatemalans head-on and managed to push them back a little before being surrounded.

Meanwhile, General Eusebio Bracamonte attacked the Guatemalan rear which caused a panic in Carrera's entire army who began to flee.

Carrera was forced to withdraw and leave the cities of Santa Ana, Chalchuapa, and Ahuachapán as well as the other towns he had occupied.