Alexander was taken prisoner, with his father and his brother Antigonus, by the Roman general Pompey, on the capture of Jerusalem in 63 BC, but escaped his captors as they were being conveyed to Rome. In 57 he appeared in Judaea, raised an army of 10,000 infantry and 1500 cavalry, and fortified Alexandrium and other strong posts. Alexander's uncle Hyrcanus (with whom Alexander's father Aristobulus had clashed) applied for aid to Gabinius, who brought a large army against Alexander, and sent Mark Antony with a body of troops in advance. In a battle fought near Jerusalem, Alexander was soundly defeated, and took refuge in the fortress of Alexandrium. Through the mediation of his mother, he was permitted to depart, on condition of surrendering all the fortresses still in his power. In the following year, during the expedition of Gabinius into Egypt, Alexander again incited the Jews to revolt, and collected an army. He massacred all the Romans who fell in his way and besieged the rest, who had taken refuge on Mount Gerizim. After rejecting the terms of peace which were offered to him by Gabinius, he was defeated near Mount Tabor with the loss of 10,000 men. The spirit of his adherents, however, was not entirely crushed, for in 53, on the death of Marcus Licinius Crassus, he again collected some forces, but was compelled to come to terms by Cassius in 52. In 49, when civil war broke out, Julius Caesar set Alexander's father Aristobulus II free, and sent him to Judaea to further his interests there. He was poisoned on the journey, and Alexander, who was preparing to support him, was seized at the command of Pompey, and beheaded at Antioch.