The most notorious rebel of Seibo was a daring Dominican bandit with the nom de guerre of Vicentico Evangelista. In March 1917 he brutally executed two American civilians, engineers from an American-owned plantation, who were lashed to trees, savagely hacked with machetes, then left dangling for ravenous wild boars. He led Marine pursuers on a merry chase before surrendering on July 5 of that year. Two days later Vicentico was shot and killed by Marines "while trying to escape". On August 13, 1918, a five-man Marine patrol was ambushed near Manchado; four Marines were killed and the survivor wounded. By 1919 the Marines had received radios that made it easier to coordinate their efforts and six Curtiss "Jenny" biplanes that allowed them to expand the reach of their patrolling and even to bomb some guerrilla outposts. The unrest in the eastern provinces lasted until 1922 when the guerrillas finally agreed to surrender in return for amnesty. During the course of the campaign between 1916 and 1922, the Marines claim to have killed or wounded 1,137 "bandits", while 20 Marines were killed and 67 wounded. (Forty U.S. sailors died separately when a hurricane wrecked their ship on Santo Domingo's rocky shore.)