When the king came back from Aragon and arrived in Seville, he assembled his forces in order to wage war against the Red Emir of Granada, declaring that he wished to go to the aid of Emir Mohammed and that it was on account of the Red Emir that he had made peace with Aragon against his true wishes. Emir Mohammed went to the king with a force of 400 horsemen and allied himself to him. The king reached Antequera but did not succeed in reducing it and withdrew. He ordered his men to make their way onto the plain of Granada. Comprising 6,000 horsemen, the Christians won two battles there, and numbers of the Moors were killed and taken captive. In another battle the Christians were defeated, some of them were killed, and the Master of Calatrava, together with Sancho Pérez de Ayala and others, was taken prisoner.

Thinking that he would please King Pedro, the Red Emir gave a warm welcome to the Master and to the other men, with the aim of softening the king's ill will towards him. He released the master and a number of the other knights, giving them some of his jewellery, and sent them back to the king. The king showed very little gratitude to him for so great a present; rather, a few days later, he made another incursion, won four Moorish townships, placing a garrison in each of them, and returned to Seville.

The Moors attacked one of the townships, Sagra by name, breaching its wall and forcing their way in. Fernán Delgadillo, its governor, came to an agreement with them, was given safe conduct and made his way to the king, who promptly had him killed. The king then made another raid on Granada, captured a number of townships and returned again to Seville.

The Moors were all aggrieved at this and told the Red Emir that, owing to the conflict which he, the Red Emir, had with Emir Mohammed, the king had now invaded their territory three times, and that the emirate of Granada was being laid waste.