In early 1950, a CIA officer found Castillo Armas attempting to get weapons from Somoza and Trujillo. He met with the CIA a few more times before November 1950, when he launched an attack against Matamoros, the largest fortress in the capital, and was jailed for it before bribing his way out of prison. Castillo Armas told the CIA he had the support of the "Guardia Civil" (Civil Guard), the garrison at Quetzaltenango, Guatemala's second-largest city, and of the commander of Matamoros. The engineer dispatched by the CIA also told them Castillo Armas had the financial backing of Somoza and Trujillo.