It was not yet dusk when Cortés and his followers re-entered the city; and the general’s first act was to ascend a neighboring _teocalli_ and reconnoitre the surrounding country. He there beheld a sight which might have troubled a bolder spirit than his. The surface of the salt lake was darkened with canoes, and the causeway, for many a mile, with Indian squadrons, apparently on their march toward the Christian camp. In fact, no sooner had Guatemozin been apprised of the arrival of the white men at Xochimilco than he mustered his levies in great force to relieve the city. They were now on their march, and, as the capital was but four leagues distant, would arrive soon after nightfall.[378] Cortés made active preparations for the defence of his quarters. He stationed a corps of pikemen along the landing where the Aztecs would be likely to disembark. He doubled the sentinels, and, with his principal officers, made the rounds repeatedly in the course of the night. In addition to other causes for watchfulness, the bolts of the crossbowmen were nearly exhausted, and the archers were busily employed in preparing and adjusting shafts to the copper heads, of which great store had been provided for the army. There was little sleep in the camp that night.[379] It passed away, however, without molestation from the enemy. Though not stormy, it was exceedingly dark. But, although the Spaniards on duty could see nothing, they distinctly heard the sound of many oars in the water, at no great distance from the shore. Yet those on board the canoes made no attempt to land, distrusting, or advised, it may be, of the preparations made for their reception. With early dawn they were under arms, and, without waiting for the movement of the Spaniards, poured into the city and attacked them in their own quarters. The Spaniards, who were gathered in the area round one of the _teocallis_, were taken at disadvantage in the town, where the narrow lanes and streets, many of them covered with a smooth and slippery cement, offered obvious impediments to the manœuvres of cavalry. But Cortés hastily formed his musketeers and crossbowmen, and poured such a lively, well-directed fire into the enemy’s ranks as threw him into disorder and compelled him to recoil. The infantry, with their long pikes, followed up the blow; and the horse, charging at full speed as the retreating Aztecs emerged from the city, drove them several miles along the main land.