Judah, on the defeat of the enemy, returned to Jerusalem, and bent his mind on the purification and restoration of the temple, which having been overthrown by Antiochus, and profaned by the Gentiles, presented a melancholy spectacle. But as the Syrians held the citadel, which being connected with the temple, but standing above it in position, was really impregnable, the lower parts proved inaccessible, as frequent sallies from above prevented persons from approaching them. But Judah placed against these assailants a very powerful body of his men.
Thus the work of the sacred building was protected, and the temple was surrounded with a wall, while armed men were appointed to maintain a perpetual defence. And Lysias, having again returned into Judæa with increased forces, was once more defeated with a great loss both of his own army and of the auxiliaries, which being sent to him by various states had combined with him in the war. In the meantime, Antiochus, who, as we have said above, had marched into Persia, endeavored to plunder the town of Elymus, the wealthiest in the country, and a temple situated there which was filled with gold; but, as a multitude flocked together from all sides for the defense of the place, he was put to flight.
Moreover, he received news of the want of success which had attended the efforts of Lysias. Thus, from distress of mind, he fell into bodily disease. But as he was then tormented with internal sufferings, he remembered the miseries which he had inflicted on the people of God, and acknowledged that these evils had deservedly been sent upon him. Then, after a few days, he died, having reigned eleven years. He left the kingdom to his son Antiochus, to whom the name of Eupator was given.
Source: Sacred History (New Advent)