He therefore abandoned his attack upon the rock, and selected a position with his brigantines, where he would be able to observe all the enemy's movements, and steer off in any direction he might choose. He likewise issued orders to the respective commanders of the brigantines not to commence an attack on the canoes before the wind, which had just commenced blowing from the land, should have increased. When the Mexicans found our fleet was moving off again, they not incorrectly ascribed it to fear, and they immediately advanced with their canoes to fall upon the brigantines. There now suddenly arose a stiffish breeze, our rowers pulled with all their might, and Cortes ordered the brigantines to run right in among the canoes. Numbers were bored into the ground, many of the enemy killed and wounded, and all the rest of the canoes turned round, and made off at a rapid rate, to seek refuge between the houses built in the lake, where they could not be followed by the brigantines. This was our first naval engagement, and Cortes gained the victory, thanks be to the Almighty.
After this encounter he steered for Cojohuacan, where Oli had taken up his position. Here again he fell in with large bodies of the enemy, who lay in wait for him at a point of considerable danger, and attempted to carry off two of the brigantines. They attacked him at the same time from their canoes, and from the tops of the temples. Cortes now fired in upon them with the cannon, and killed great numbers. The artillerymen fired away so incessantly upon this occasion, that all their powder was consumed, and some of them had their faces and hands burnt. Cortes then despatched the smallest brigantine to Iztapalapan, to bring away all the powder Sandoval had with him there, and wrote word to him not on any account to quit that place. He himself staid the two next days with Oli, on whose position the enemy continued their attacks without intermission.
I must now also relate what took place at this time in Tlacupa, where I was stationed with Alvarado.