Initially, Monzón was not willing to hand over power to Castillo Armas. The US State Department persuaded Óscar Osorio, the president of ElSalvador, to invite Monzón, Castillo Armas, and other significant individuals to participate in peace talks in San Salvador. Osorio agreed to do so, and after Díaz had been deposed, Monzón and Castillo Armas arrived in the Salvadoran capital on June 30. Castillo Armas wished to incorporate some of his rebel forces into the Guatemalan military; Monzón, was reluctant to allow this, leading to difficulties in the negotiations. Castillo Armas also saw Monzón as having been late to enter the fight against Árbenz. The negotiations nearly broke down on this issue on the very first day, and so Peurifoy, who had remained in Guatemala City to give the impression that the US was not heavily involved, traveled to San Salvador. Allen Dulles later said that Peurifoy's role was to "crack some heads together".