When Cortes brought out his fleet of brigantines upon the lake, he went in the first place to attack an insular rock close beside Mexico, on which a vast number of the inhabitants of that city and other places in the neighbourhood had taken shelter. Immediately on perceiving his intentions, their whole force collected from every part of the lake, and proceeded against him in not less than 4000 large canoes full of warriors. On perceiving this immense number of boats coming to attack him, Cortes withdrew with his brigantines into an open part of the lake, ordering his captains to wait patiently for a breeze of wind which then began to blow. As the enemy supposed that this movement proceeded from fear, they immediately closed up around the flotilla with shouts of triumph. The wind now sprung up, and the whole fleet made sail through the throng of canoes, plying their oars at the same time, and run down and overset great numbers of the Mexican canoes, compelling all the rest to fly for shelter to the recesses and shallows on the borders of the lake. After this, Cortes made sail to Cojohuacan[4], where he was again attacked by the Mexicans, both by means of their canoes on the water, and from their temples on the land: But Cortes brought four guns to bear upon them, by which he did considerable execution. During this action his powder magazine blew up, owing to some mismanagement of the gunners, by which many of his people were wounded. This unfortunate accident obliged him to detach his smallest brigantine to Sandoval for a supply of ammunition. He remained at Cojohuacan for two days with the flotilla, repairing the injury his ship had sustained from the explosion. When we were assured that the flotilla was out upon the lake, Alvarado marched out with our division to the causeway of Tacuba, as far as the bridge, in which we were constantly engaged with the enemy to very little purpose, except that we repaired the passes in our rear as we advanced, and did not now suffer the cavalry to come upon the causeway, as we had found by experience that they were of very little service, and besides that their horses were exposed to much danger. Finding that he could not sufficiently annoy the enemy in his present post at Iztapalapa, where the Mexicans had possession of the houses which were built in the water, Sandoval advanced by a causeway to a more commanding situation[5]. When this was noticed from Mexico, a large detachment of warriors came over in canoes, with orders to cut the causeway in the rear of our troops. Cortes observed this, and immediately made sail with his vessels to the relief of Sandoval, giving orders at the same time to De Oli to march a body of troops by the causeway for the same purpose. Having relieved Sandoval by these means, Cortes ordered him to remove with his division from Iztapalapa to Tepeaquilla or Tepejacac, where the church of our Lady of Guadalupe now stands, in which many wonderful miracles have been performed.