Cortés had been delayed till the fleet should be fully prepared. On the 31st of May, following Corpus Christi day, he was able to despatch Sandoval, who, reënforced by some forty thousand allies awaiting him on the Chalco border, marched against Iztapalapan. Although severely crippled by Cortés’ expedition, this town still figured as a stronghold of too great importance to be left in the rear. Advised of the movement, the Mexicans hurried by road and water to aid in covering the retreat of the inhabitants. Suddenly smoke columns were observed in different parts of the lake, and cries of alarm ran through the town. Yet more and more hurriedly the people fled, and while one body of warriors retired along the causeway to Mexico, others departed in canoes. The Spanish forces pressed onward in close pursuit, and slaughter, pillage, and torch accompanied them. The chief cause of the panic was the appearance of the brigantines, which had set sail shortly after Sandoval’s departure, attended by a large number of Tezcucan canoes18 whose object was to coöperate against Iztapalapan. On approaching it the vessels passed close to a steep rocky isle, the Tepepulco, since known as El Peñol del Marqués,19 occupied by a large number of fugitives who shouted defiance, and showered stones and arrows. Finding that Sandoval required no aid, Cortés resolved
to inflict a lesson on the insolent islanders. The Mexicans appeared confident in the impregnable strength of the rock, and gave so warm a reception to the hundred and fifty men with whom Cortés began to climb it, that fully a score were wounded at the onset. The brigantines turned their guns upon them, however, and under this cover the soldiers speedily gained the summit, there to wreak bloody vengeance. Not a man was spared, only the women and children. “It was a beautiful victory!” exclaims Cortés.