In August 1462, a Christian convert from Gibraltar passed word to the Castilians that a large part of the garrison had temporarily left the town. Ali-l-Carro, a converted Moor, informed the Governor of
Tarifa, Alonzo of Arcos, that the fortress was almost defenseless. The next day Arcos made an attack. He captured some Moorish soldiers and tortured them to gain information of the size of the garrison, which turned out to be too large for him to succeed with his own small forces. Alonzo of Arcos called for help from the surrounding towns, from his kinsman Alonzo, Count de Arcos, Alcade of Algeciras and from
Juan Alonso de Guzmán, 1st Duke of Medina Sidonia, the most powerful noble in the region. The Duke was son of Enrique Pérez de Guzmán, who had died in 1435, and had assisted him in that attack. When the first troops arrived, the Governor Alonzo of Arcos made an attack that was easily repelled. However, another deserter brought news that the garrison was arguing whether to surrender, and if so on what terms. Soon after a delegation of Moors came and offered to surrender if they were allowed to leave and take their property. Alonzo of Arcos deferred the decision to accept these terms until someone with greater authority arrived.
Rodrigo, son of the Count of Arcos, reached the scene. He also felt unable to grant conditions of surrender. However, Rodrigo took control of the city gates, at which the Moors retreated to the castle. When the Duke of Medina Sidonia eventually showed up there was a dispute over who should have the honor of taking the castle. To avoid coming to blows, it was agreed that the Duke and the Count of Arcos would enter the fortress at the same time and set up their banners simultaneously. After a few days of negotiation, on condition of being allowed to leave with their possessions the defenders surrendered to Medina Sidonia. The castle was taken on 16 August 1462. The "siege" is perhaps misnamed, since there was little fighting and no use of siege weapons. ==Aftermath==