The misfortunes of Thebes had not come to an end with the banishment of Oedipus, and fate was still against the unhappy city. The plague, it is true, had stopped; but the two young princes were quarreling about the possession of the throne.
Both wanted to reign, and neither wished to share the throne with his brother. After much dispute, they agreed at last that each should reign a year in turn.
Eteocles, the elder, was of course allowed to rule during the first year; while Polynices went to pay a visit to Adrastus, King of Argos. Here he was warmly welcomed and hospitably entertained; but when the year was ended, he hurried back to Thebes to reign in his turn.
When he came to the city, however, Eteocles refused to give up the scepter, and, calling out his guards, made use of his power to drive Polynices out of the town. This was very wrong, for a promise should always be kept; and it made Polynices so angry, that he said he would return with an army, and force his brother to act fairly.
Polynices therefore hurried back to Argos, and soon persuaded Adrastus, with five other kings and noted warriors, to go with him to Thebes, and help him take the throne by force.
When Eteocles heard that seven kings were coming with a large army to make him give up the throne of Thebes, he made up his mind to fight hard to keep it. After strengthening the city walls, laying in a great stock of provisions, and securing the help of seven brave allies, Eteocles closed the gates of Thebes, and calmly awaited the arrival of the enemy.
Meanwhile the seven chiefs were marching from Argos to Thebes. They came at last to the forest of Nemea, where Hercules, the chief hero of Argos, had once slain a terrible lion. This monster had long lived in the forest, filling the hearts of all the people with dread; and when Hercules came out of the forest, wearing the skin of the lion, they had greatly rejoiced.