The large Castilian army encamped in the Vega de Granada and, after looting the immediate area, resolved to return to Castile satisfied with the collected booty. A siege of the city of
Granada was deemed impossible at the time. The withdrawal started on 25 June 1319, in very hot weather; infante Peter led the
vanguard while infante John commanded the
rearguard. At this point
Sultan Ismail decided to strike. A large force of elite Moorish
cavalry, the "
Volunteers of the Faith", led by
Uthman ibn Abi al-Ula, exited from Granada and started harassing the retreating Castilians of infante John. These minor attacks turned into a general assault when the Granadines realized the Castilians were losing their cohesion during their retreat and were unable to fight back effectively. Infante John requested the aid of infante Peter, but Peter, according to chroniclers, was at first dissuaded from this by his companions. When he finally decided to help his uncle, he fell from his horse as he led his men, and was trampled and killed. At this point the vanguard thought only of flight and to reach the Castilian border; in their panic, many men drowned while attempting to cross the
river Genil in full armour. The unsupported rearguard collapsed, with infante John falling victim probably to
stroke or
heat stroke leading to a spectacular Moorish victory. Most of the fighting took place in the present-day municipality of
Pinos Puente. A hill on the battlefield was given the name
Cerro de los Infantes ("Hill of the Infantes"). == Aftermath ==