Cassander, Ptolemy, Lysimachus, and Seleucus all likewise called themselves kings. And still the war went on. Demetrius was sent against the island of Rhodes, which belonged to Ptolemy, and besieged the city a whole year, but could not take it, and was obliged to make peace with the islanders at last, and to give them all the machines he had used in the siege. These they sold for 300 talents, and used the money to make an enormous brazen statue of Apollo, to stand with one foot on each side of the entrance of the harbour. Ships in full sail could pass under it, and few men could grasp its thumb with their arms. It was called the Colossus of Rhodes, and was counted as the seventh wonder of the world, the others being the Temple of Diana at Ephesus, the Tomb of Mausolus, the Lighthouse of Messina, the Walls of Babylon, the Labyrinth of Crete, and the Pyramids of Egypt. They also consecrated a grove to Ptolemy for the assistance he had given to them. Demetrius then went to Greece, and tried to overthrow Cassander, but the other kings joined against him, and he was obliged to go home, for Seleucus was threatening Antigoneia. Antigonus and Demetrius collected their forces, and fought a great battle at Ipsus, where Seleucus brought trained elephants from India, which had lately begun to be used in battle, and were found to frighten horses so as to render them quite unmanageable. Demetrius, however, thought he had gained the victory, but he rushed on too fast, and left his father unsupported, so that poor old Antigonus, who was eighty years of age, was shut in by the troops of Seleucus and killed. Demetrius had to retreat to Ephesus with his broken army. The Athenians, who had made so much of him before, now turned against him, and made a law to punish with death anyone who should speak of making peace with him. However, Cassander died, and his sons quarrelled about the kingdom, so that Demetrius found it a good opportunity to return to Greece, and very soon made the Athenians open their gates to him, which they did in fear and trembling; but he treated them so mercifully that they soon admired him as much as ever. [Picture: Macedonian soldier] Then he attacked Sparta, and defeated her king, taking the city which had so long held out against the Macedonians; but he had only just done so when he heard that Ptolemy had recovered all Cyprus except Salamina, and that Lysimachus had seized all Asia Minor, so that nothing was left to him but his army.