Here he found the valiant Gonzalo de Sandoval, who, with about twenty other cavaliers, had led the van, composed of two hundred Spanish foot-soldiers. They were halted before the third and final breach in the causeway, a ditch as wide and deep as those which had been passed. Fortunately it was not so closely beset by the enemy, who were still engaged with the centre and rear, and the gallant cavaliers plunged without hesitation into the water, followed by the foot, some swimming, some clinging desperately to the manes and tails of the horses, some carried to the bottom by the weight of the fatal gold with which they were heavily laden. On leaving the fortress in which they had so long defended themselves, much of the gold which they had gathered was necessarily abandoned. Cortez told the soldiers to take what they wished of it, but warned them not to overload themselves, saying, "He travels safest in the dark night who travels lightest." Many of those who failed to regard this wise counsel paid for their cupidity with their death. Those who safely passed this final ditch were at the end of their immediate peril. Soon they were off the causeway and on solid ground, where the roar of the battle came more faintly to their ears. But word came to them that the rear-guard was in imminent danger and would be overwhelmed unless relieved. It seemed an act of desperation to return, but the valiant and warm-hearted cavaliers did not hesitate when this cry for aid was heard. Turning their horses, they galloped back, pushed through the pass, swam the canal again, and rode into the thick of the fight on the opposite section of the causeway. The night was now passing, and the first gray light of day was visible in the east. By its dim illumination the frightful combat could be seen in all its horrid intensity. Everywhere lay dead bodies of Christian or pagan; the dark masses of the warriors could be seen locked in deadly struggle crowding the blood-stained causeway; while the lake, far and near, was crowded with canoes, filled with armed and ardent Aztec warriors, yelling their triumphant war-cry. Cortez and his companions found Alvarado, who led the rear, unhorsed and wounded, yet fighting like a hero. His noble steed, which had borne him safely through many a hard fight, had fallen under him. With a handful of followers he was desperately striving to repel the overwhelming tide of the enemy which was pouring on him along the causeway, a dozen of the Indians falling for every Spaniard slain. The artillery had done good work in the early part of the contest, but the fury of the assault had carried the Aztecs up to and over the guns, and only a hand-to-hand conflict remained. The charge of the returning cavaliers created a temporary check, and a feeble rally was made, but the flood of foes soon came on again and drove them resistlessly back.