Thebans defended their city stubbornly, Demetrius often forced his men to attack the city at great cost, even though there was little hope of capturing it. It is said that, distressed by the heavy losses, Antigonus asked his father: "Why, father, do we allow these lives to be thrown away so unnecessarily?" Demetrius appears to have showed his contempt for the lives of his soldiers by replying: "We don't have to find rations for the dead." But he also showed a similar disregard for his own life and was badly wounded at the siege by a bolt through the neck. In 291 BC, Demetrius finally took the city after using siege engines to demolish its walls. But control of Macedonia and most of Greece was merely a stepping stone to his plans for further conquest. He aimed at nothing less than the revival of Alexander's empire and started making preparations on a grand scale, ordering the construction of a fleet of 500 ships, many of them of unprecedented size. Such preparations and the obvious intent behind them, naturally alarmed the other kings, Seleucus, Ptolemy, Lysimachus, and Pyrrhus, who immediately formed an alliance. In the spring of 288 BC Ptolemy's fleet appeared off Greece, inciting the cities to revolt. At the same time, Lysimachus attacked Macedonia from the east while Pyrrhus did so from the west. Demetrius left Antigonus in control of the rest of Greece, while he hurried to Macedonia. By now the Macedonians had come to resent the extravagance and arrogance of Demetrius, and were not prepared to fight a difficult campaign for him. In 287 BC, Pyrrhus took the Macedonian city of Beroea and Demetrius's army promptly deserted and went over to the enemy who was much admired by the Macedonians for his bravery. At this change of fortune, Phila, the mother of Antigonus, killed herself with poison. Meanwhile, Athens revolted. Demetrius therefore returned and besieged the city, but he soon grew impatient and decided on a more dramatic course. Leaving Antigonus in charge of the war in Greece, he assembled all his ships and embarked with 11,000 infantry and all his cavalry to attack Caria and Lydia, provinces of Lysimachus. As Demetrius was chased across Asia Minor to the Taurus Mountains by the armies of Lysimachus and Seleucus, Antigonus attained success in Greece. Ptolemy's fleet was driven off and Athens surrendered. In the wilderness In 285 BC,