The Aztecs ran their canoes along the sides of the causeway, climbed up, and charged the ranks of the Spaniards, with their Tlascalan allies. The soldiers shook them off as best they could, rode over them with their horses, and, with their pikes and their swords, drove them headlong down the sides of the dike. They halted and waited for the bridge to be brought up; but a terrible calamity had occurred, for the bridge had been so borne down by the weight of the artillery passing over it, that it had jammed firmly into the sides of the dike and was immovable. The tidings spread rapidly from man to man and a cry of despair arose, for all means of advance were cut off, and the Spaniards were caught in a trap. Those behind pressed forward, trampling the weak and the wounded under foot, and forcing those in front over the gulf. Some of the cavaliers succeeded in swimming their horses across, but many rolled back into the lake when attempting to ascend the opposite bank. The infantry followed in a panic, and many of the men were pierced by the Aztec arrows, or struck down by war clubs. Some were dragged into the canoes to be later sacrificed to the great and awful stone god. Fierce battle cries rose above the tumult of war, and these were mingled with the cries of despair of the drowning Spaniards. By degrees the opening in the causeway was filled up by the wreck of the wagons, guns, rich bales of stuffs, chests of solid ingots, and bodies of men and horses. Walking on top of this dismal ruin, those in the rear were able to reach the other side. As the attention of the Aztec warriors now fell upon the rich spoil that strewed the ground, the pursuit of the Spaniards ceased. The troops pressed forward through the village of Popotla, where Cortés dismounted from his weary war-horse, and, sitting down upon the steps of an Indian temple, looked mournfully at his broken army, as the thin and disordered ranks filed past. It was a heartrending spectacle. He knew, however, that this was no time to give away to vain regrets, so he speedily mounted, and led his men through Tlacopan. The broken army, disorganized and half starved, moved slowly toward the sea coast. On the seventh day it reached the mountain range which overlooks the plains of Otumba, and the scouts, climbing the steep hillside, reported that a mighty host of warriors was in the valley, ready to dispute their passage. Every chief of importance had taken the field, and, as far as the eye could reach, extended a moving mass of glittering shields and spears, mingled with the banners and the bright feather-mail of the caciques.