A week later, the Marines encountered another entrenched rebel force at Guayacanas. The rebels kept up single-shot fire against the automatic weapons of the Marines before the Marines drove them off. The battle was important in the history of the 4th Marines insofar as the regiment subsequently acquired its first Medal of Honor recipient. First Sergeant Roswell Winans, while manning his machine gun, displayed such exceptional valor that he was later awarded the nation's highest military honor. Sergeant Winans obtained his award for the bravado that he demonstrated when for a time he single-handedly raked enemy lines with his weapon. Then, when the gun jammed, he set about clearing it in full view of the Dominicans without regard to his personal safety. With his supporters defeated, Arias surrendered on July 5 in exchange for being pardoned.