As the years went on Muley Abul Hassan became sadly stricken with age. He grew nearly blind and was bed-ridden with paralysis. His brother Abdallah, known as El Zagal, or "The Valiant," commander-in-chief of the Moorish armies, assumed his duties as a sovereign, and zealously took up the quarrel with his son. He attempted to surprise the young king at Almeria, drove him out as a fugitive, and took possession of that city. At a later date he endeavored to remove him by poison. It was this attempt that spurred Boabdil to the enterprise we have just described. El Zagal was now full king in Granada, holding the Alhambra as his palace, and his nephew, who had been a wanderer since his flight from Almeria, was instigated to make a bold stroke for the throne. On the day after the secret return of Boabdil battle raged in the streets of Granada, a fierce encounter taking place between the two kings in the square before the principal mosque. Hand to hand they fought with the greatest fury till separated by the charges of their followers. For days the conflict went on, death and turmoil ruling in Granada, such hatred existing between the two factions that neither side gave quarter. Boabdil was the weaker in men. Fearing defeat in consequence, he sent a messenger to Don Fadrique de Toledo, the Christian commander on the border, asking for assistance. Don Fadrique had been instructed by Ferdinand to give what aid he could to the young king, the vassal of Spain, and responded to Boabdil’s request by marching with a body of troops to the vicinity of Granada. No sooner had Boabdil seen their advancing banners than he sallied forth with a squadron to meet them. El Zagal, who was equally on the alert, sallied forth at the same time, and drew up his troops in battle array. The wary Don Fadrique, in doubt as to the meaning of this double movement, and fearing treachery, halted at a safe distance, and drew off for the night to a secure situation. Early the next morning a Moorish cavalier approached the sentinels and asked for an audience with Don Fadrique, as an envoy from El Zagal. The Christian troops, he said on behalf of the old king, had come to aid his nephew, but he was ready to offer them an alliance on better terms than those of Boabdil. Don Fadrique listened courteously to the envoy, but for better assurance, determined to send a representative to El Zagal himself, under protection of a flag. For this purpose he selected Don Juan de Vera, one of the most intrepid and discreet of his cavaliers, who had in years before been sent by King Ferdinand on a mission to the Alhambra.