destroy barricades and walls, and to scale buildings. Four cannon were also brought. The rear was protected by a portion of the cavalry. The Aztecs were at first amazed at the curious moving turrets, and feared that they might contain more terrible destroyers even than the grape-charged guns; but finding them less dangerous, they continued their efforts, and fast and thick poured the stones and arrows on the line of advance, particularly on the engines, which were severely damaged. The march proceeded, however, with more or less interruption till a raised bridge was reached on the main road, where the Indians had gathered in vast numbers, with an evident determination to check the expedition. The turrets were brought alongside the houses adjoining the canal in order to clear the crowded roofs, but regardless of the volleys from the firelocks, the natives on the roofs plied their missiles only the faster, letting fly heavy rocks13 upon the engine coverings, so as to render them untenable and hinder the manœuvring of the cannon. This success enabled the warriors beyond the canal and behind the barricades to maintain their assault with great effect, and to prevent a further advance. They gained a considerable advantage by a change of tactics in directing the missiles to a great extent against the legs of the Spaniards, to their serious discomfiture.14 After spending the greater part of the forenoon in an unsuccessful attempt to destroy the houses nearest the canal, and to fill a passage across it, the troops retired to the fort greatly disheartened. Even the Tlascaltecs, who were usually so glib of tongue in replying to Aztec taunts, for once held their peace.15
Meanwhile the battle raged fiercely round the fort. The temple in front of it, since its evacuation by the Spaniards, had been occupied by some five hundred Mexicans, chosen men,16 who introduced a large quantity of ammunition and supplies, and began to batter the besieged quarter. It was this shower which had first damaged the turrets and harassed the march. Perceiving the danger of leaving so commanding a position in hostile hands, Cortés had sent his chamberlain, Escobar,