The arrangements being completed, the three divisions marched at once up the several streets. Cortés, dismounting, took the van of his own squadron, at the head of his infantry. The Mexicans fell back as he advanced, making less resistance than usual. The Spaniards pushed on, carrying one barricade after another, and carefully filling up the gaps with rubbish, so as to secure themselves a footing. The canoes supported the attack, by moving along the canals and grappling with those of the enemy; while numbers of the nimble-footed Tlascalans, scaling the terraces, passed on from one house to another, where they were connected, hurling the defenders into the streets below. The enemy, taken apparently by surprise, seemed incapable of withstanding for a moment the fury of the assault; and the victorious Christians, cheered on by the shouts of triumph which arose from their companions in the adjoining streets, were only the more eager to be first at the destined goal. Indeed, the facility of his success led the general to suspect that he might be advancing too fast; that it might be a device of the enemy to draw them into the heart of the city and then surround or attack them in the rear. He had some misgivings, moreover, lest his too ardent officers, in the heat of the chase, should, notwithstanding his commands, have overlooked the necessary precaution of filling up the breaches. He accordingly brought his squadron to a halt, prepared to baffle any insidious movement of his adversary. Meanwhile he received more than one message from Alderete, informing him that he had nearly gained the market. This only increased the general’s apprehension that, in the rapidity of his advance, he might have neglected to secure the ground. He determined to trust no eyes but his own, and, taking a small body of troops, proceeded at once to reconnoitre the route followed by the treasurer. He had not proceeded far along the great street, or causeway, when his progress was arrested by an opening ten or twelve paces wide, and filled with water, at least two fathoms deep, by which a communication was formed between the canals on the opposite sides. A feeble attempt had been made to stop the gap with the rubbish of the causeway, but in too careless a manner to be of the least service; and a few straggling stones and pieces of timber only showed that the work had been abandoned almost as soon as begun.[46] To add to his consternation, the general observed that the sides of the causeway in this neighborhood had been pared off, and, as was evident, very recently. He saw in all this the artifice of the cunning enemy, and had little doubt that his hot-headed officer had rushed into a snare deliberately laid for him. Deeply alarmed, he set about repairing the mischief as fast as possible, by ordering his men to fill up the yawning chasm.