[Translation of the Nahuatl (right-hand column) by James Lockhart:]
the weapons clashed against each other, there was a head-on encounter.
And in Amaxac a person whose name was Chalchiuhtepehua took shelter behind a wall. He was one of the Mexica from Tlatelolco. He looked closely at a horse in order to spear it, and when he speared it, the Spaniard was unhorsed. Then his companions quickly seized him. Then all the warriors and noblemen went after them, keeping close to them and following behind them. They forced them back again to Copalnamacoyan, where the wall stood. Then the fighting paused; everyone went away and entered his quarters.
Once it happened that all those who were surrounding us, not including the Spaniards, went and assembled
[Translation of the Spanish (left-hand column) by James Lockhart:]
One of the Mexica of Tlatelolco, called Chalchiuhtepehua, laid an ambush, together with other soldiers he had with him, with the intention of wounding the horses. When the Spaniards reached the place of the ambush, they wounded a horse; then the Spaniard fell to the ground, and the Mexica captured him. Then they all sallied forth, for all the brave Mexica who were in the stronghold came out, and they inflicted great damage on the Spaniards and their friends, and thus they withdrew again to the tiánquiz, to the place called Copalnamacoyan, where there was a bulwark.
After this all the Indians who were enemies of the Mexica and who had the Mexica besieged agreed to fill up a lake that was greatly impeding their access to the stronghold of the Mexica. This lake was called Tlaixcuipan and was close to where the church of Santa Lucia is now. Thus the next day very early in the morning they loaded themselves up with stones, earth, adobe bricks, and wood