Matamoros had fewer than 1,000 soldiers with which to confront the royalist forces under Miguel Dambrini. Dambrini, knowing of the insurgent offensive began a retreat towards Guatemala. When the two armies finally met 6 kilometers from Tonalá, Chiapas, the first skirmishes took place resulting favorably for the rebel forces.
After this retreat, the royalist forces were pursued by the rebel cavalry where after they were obliged to take refuge at a ranch at Tonalá. When Matamoros arrived, Dambrini was obliged to capitulate, surrendering all his arms, munitions and provisions. The Spanish prisoners were all executed in the Paredón Bay. During the battle, Matamoros was wounded in the leg and was thereafter forced to stay for a time at the ranch. Soon after this victory, he was promoted to Teniente General.
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