In 1838 the liberal forces of Honduran leader Francisco Morazán and Guatemalan José Francisco Barrundia invaded Guatemala and reached San Sur, where they executed Chúa Alvarez, father-in-law of Rafael Carrera, then a military commander and later the first president of Guatemala. The liberal forces impaled Alvarez's head on a pike as a warning to followers of the Guatemalan caudillo. Carrera and his wife Petrona – who had come to confront Morazán as soon as they learned of the invasion and were in Mataquescuintla – swore they would never forgive Morazán even in his grave; they felt it impossible to respect anyone who would not avenge family members.