laborer, as he turns up the soil, encounters a glittering fragment of obsidian, or the mouldering head of a lance or arrow, or some other warlike relic, attesting that on this spot the retreating Aztecs made their last stand for the independence of their country.[93] On the day following, Cortés, at the head of his battalions, made a second entry into the great _tianguez_. But this time the Mexicans were better prepared for his coming. They were assembled in considerable force in the spacious square. A sharp encounter followed; but it was short. Their strength was not equal to their spirit, and they melted away before the rolling fire of musketry, and left the Spaniards masters of the enclosure. The first act was to set fire to some temples, of no great size, within the market-place, or more probably on its borders. As the flames ascended, the Aztecs, horror-struck, broke forth into piteous lamentations at the destruction of the deities on whom they relied for protection.[94] The general’s next step was at the suggestion of a soldier named Sotelo, a man who had served under the Great Captain in the Italian wars, where he professed to have gathered knowledge of the science of engineering, as it was then practised. He offered his services to construct a sort of catapult, a machine for discharging stones of great size, which might take the place of the regular battering-ram in demolishing the buildings. As the ammunition, notwithstanding the liberal supplies which from time to time had found their way into the camp, now began to fail, Cortés eagerly acceded to a proposal so well suited to his exigences. Timber and stone were furnished, and a number of hands were employed, under the direction of the self-styled engineer, in constructing the ponderous apparatus, which was erected on a solid platform of masonry, thirty paces square and seven or eight feet high, that covered the centre of the market-place. This was a work of the Aztec princes, and was used as a scaffolding on which mountebanks and jugglers might exhibit their marvellous feats for the amusement of the populace, who took great delight in these performances.[95] The erection of the machine consumed several days, during which hostilities were suspended, while the artisans were protected from interruption by a strong corps of infantry. At length the work was completed; and the besieged, who with silent awe had beheld from the neighboring _azoteas_ the progress of the mysterious engine which was to lay the remainder of their capital in ruins, now looked with terror for its operation. A stone of huge size was deposited on the timber. The machinery was set in motion; and the rocky fragment was discharged with a tremendous force from the catapult. But, instead of taking the direction of the Aztec buildings, it rose high and perpendicularly into the air, and, descending whence it sprung, broke the ill-omened machine into splinters! It was a total failure.