Soon after the end of World War II, Trujillo constructed an arms factory at San Cristóbal. It made hand grenades, gunpowder, dynamite, revolvers, automatic rifles, carbines, submachine guns, light machine guns, antitank guns, and munitions. In addition, some quantities of mortars and aerial bombs were produced and light artillery rebuilt. Trujillo's increasingly powerful military withstood a series of invasion attempts by leftist Dominican exiles. On June 19, 1949, an airplane carrying Dominican rebels from Guatemala was intercepted and destroyed by the Dominican coastguard at Luperón on the north coast. Ten years later, on June 14, 1959, Dominican revolutionaries launched three simultaneous attacks. At Estero Hondo and Maimón on the north coast, the rebels followed the Castro tactic of landing from ships, but the Dominican government's air power and artillery overwhelmed the attackers as they landed. At Constanza in the high mountains near the border with Haiti, a small band of armed exiles came by air. On that occasion, the heavy bombers of the Dominican Air Force came into action but were inaccurate, hitting more civilians than guerrillas. It was Dominican peasants who tracked down and captured or killed most of the fugitives, for which they received cash bounties from Trujillo's government.