In 1097, there was a fourth Almoravid invasion. Alfonso received the news when he was on his way to Zaragoza to assist his vassal Al-Mustain II in his confrontation with King Peter I of Aragon and Navarre. Once again, the Almoravid's objective was Toledo. The Christian troops were again defeated by the Almoravid army at the Battle of Consuegra on 15 August, thus confirming the period of decadence of the reign of Alfonso VI that had already begun in 1086 with the defeat in Sagrajas.