XL. However, as Pyrrhus was now overrunning Thessaly, and had pushed even as far as Thermopylæ, Demetrius left Antigonus to prosecute the siege, and himself marched to attack Pyrrhus. Pyrrhus beat a hasty retreat, and Demetrius, leaving ten thousand infantry and a thousand cavalry in Thessaly, returned to press the siege of Thebes. He now brought up his great machine, called the "City-taker," which was moved by levers with great difficulty on account of its enormous weight; so that it is said that in two months it hardly moved two furlongs, The Boeotians made a vigorous defence, and Demetrius frequently forced his soldiers to engage in battle with them, more out of arrogance than through any real necessity for fighting. After one of these battles, Antigonus, grieved at the number of men who had fallen, said, "My father, why do we allow all these men to perish, when there is no occasion for it?" Demetrius sharply answered, "Why do you take offence at this? Do you have to pay the dead?" Yet Demetrius, not wishing it to be thought that he was lavish of other men's blood and not of his own, but being anxious to fight among the foremost, was wounded by a dart thrown from a catapult, which pierced through his neck. He suffered much from this wound, but still continued the siege, and at length took Thebes for the second time. When he entered the city, he inspired the citizens with the most intense terror, as they expected to be treated with the greatest severity. He was satisfied, however, with putting to death thirteen of the citizens, and banishing a few others. Thus was Thebes taken twice within less than ten years since it was first rebuilt. As the time for the Pythian games had now come round, Demetrius took upon himself to make a most startling innovation. As the passes leading to Delphi were held by the Ætolians, he celebrated the games in Athens, declaring that it was right that especial honour should be paid there to Apollo, who is the tutelary god of the Athenians, and is said to have been the founder of their race.