most of the lake had been fenced off, but in a few days the water-patrol was able to go all around the island-city and assist each division of the army.
As the Aztecs had broken up the bridges over nearly every canal in the city, the streets were full of ugly gaps which could not be crossed by horse or foot in the daily assaults. The friendly Indians now filled these with bricks and rubbish, and strict orders were given that no advance should be made except over a solid road. But, as the Aztecs were busy every night undoing what was done by day, the work was repeated again and again.
Alvarado was the first to forget the warning. Cortez saw his command one day flying back in hot haste and the enemy, like dogs in full cry, pursuing them. In front was a bridgeless canal into which the whole party, horse and foot, were driven. In the attempt to save them Cortez was dragged off his horse, and would have been carried away in a canoe had not several of his men sacrificed their own lives to save the life of their general. Forty-five Spaniards and a thousand Indians were lost in this battle. As the survivors retreated to the great square to defend themselves against the yelling throng which pressed upon them from every side, faint odors of burning incense of a kind only used in sacrifices came floating down from a high tower near by. Looking up, the Spaniards saw what chilled the life-blood in their hearts. Aztec priests were dragging several victims to sacrifice, and, from their white skins, they knew them to be their own fellow-countrymen. They saw the wretched captives made to dance before the idol.
This victory was celebrated by the Mexicans with wild enthusiasm. Drums were beaten and horns were blown. Messengers were sent to every old ally, carrying the
