All was ready on the 28th of April, 1521. The brigantines were manned with European troops and artillerymen; but as usual the mass of the army was made of native auxiliaries, probably underestimated by Cortez at 80,000 men. Altogether the Spanish nucleus numbered about 1100, half of them lately come to join the veterans. Efforts were made to arrange terms of peace, but the Aztecs refused to listen to Cortez’ complaints of bad treatment and disloyal conduct on the part of his late hosts.
At every point of the advance to the city, Cortez encountered stubborn enmity. There was fighting both on the lake and on the shore, that showed the temper of the people. The brigantines were surrounded by a flotilla of canoes as they proceeded on their way; but it was an unequal combat because the frail canoes of the Aztecs were exposed to the gunfire of the ships. Under the protection of the brigantines a landing was effected on the causeway. Step by step, the defenders were forced back towards the town; as long as they fought on the causeway they were exposed to the raking volleys of the guns on the brigantines.
It was a long, tedious process to take the many barricades of the city, and even when the principal street was reached the determined onslaught of the Aztecs forced the Spaniards back to the causeway bridges. No real ground was gained in these first skirmishes, although there was a concerted plan between Cortez and his lieutenants that they should make for the center of the city at the same time. While the siege was being resisted with such desperation, the straits of the Aztecs induced the neighboring pueblos to send out large contingents of men to break the power that had so long kept them in bondage. Cortez notices especially the support given him from Texcoco both in men and in provisions; they kept on the lake 1000 canoes going and coming with supplies, and 32,000 warriors.
In order to starve the city out, the water supply had been cut off before the siege began, and it was hoped that by guarding the causeways no food could be brought in. Much skill was shown by the Aztecs in overcoming these difficulties; they sent out many canoes by night, a flotilla of specially large canoes filled with warriors who did not hesitate to grapple with the brigantines. One they captured, and they inflicted heavy losses on the equipment of others. The resourcefulness of the defenders was worthy of the skilled campaigners of Europe; but the problem of the food supply could not be solved by deeds of heroism, and famine was more destructive than the weapons of their enemies. They faced not only the actual distress from scarcity of supplies but also the desertion of the city itself by large numbers of warriors who could not be fed within the walls.
The methods of warfare on both sides were worthy of the combatants. Whenever the Spaniards or their allies were taken prisoners, they were treated as victims for sacrifice and offered up in the various temples of the gods with ordinary ceremonial rites. The Spaniards, whenever they entered the streets, burnt and destroyed everything within reach, temples and houses. The rage of the Aztecs at the destruction of all they held dear showed itself in their furious attacks on their enemies as they drew back at nightfall to their camp outside.
There was no thought of coming to terms, although the losses were heavy and the besieging force under Cortez alone was more than 100,000 men, and his flotilla of canoes was 3000. The chief aim of the Spanish ruler was to take the market-place, and plans for a general assault were arranged, now that the blockade of the city was strictly kept. From this center it was hoped all the streets could be cleared. The large number of allies who each time the town was assaulted swarmed over the roofs of the houses and made light of all other obstructions, seemed to promise a speedy termination of the struggle. But before, in the general attack the inclosure of the town was reached, the Aztecs in canoes and on the various land approaches, which had now been partially destroyed, made an unexpected sally. There was a call to arms sounded from the apex of one of the principal temples, the ritual drum being beaten whose tones could be heard at a distance of two or three leagues. Instantly, as the Indians came rushing upon them, the Spaniards were thrown in a panic, and made a precipitate retreat. Cortez was himself in danger and would have been killed, had not his enemies made strenuous efforts to take him alive in order that he might be kept for a sacrificial offering. None of the other captains fared better; Alvarado’s men narrowly escaped destruction.
Many European prisoners were made, and from their camp the Spaniards could watch their comrades being offered up to the sanguinary deities of the Aztec religion. They were pierced with stone knives and their palpitating hearts were drawn out as they lay recumbent on the stone altars that capped the temple pyramids. At the same time the men in the camp had to listen to the threats of their foes who, close at hand, promised them the same fate as their comrades. There was no inclination at this point on the part of Cortez and his men to resume the fight; orders were given to restrict operations to the defense of the camp. But the temper of the native allies was not affected by the defeat. The Tlaxcalans especially took the lead in harassing their enemies, while the Spaniards kept to their quarters. They also suggested a plan by which the remaining supplies of food and drink might be cut off.
This gradual process of attrition had its natural effect on the powers of resistance of the Aztecs. Cuauhtemoc was forced to cover up the losses in his army by disguising the women in the city as warriors. Standing on the flat roofs of the houses they were easily taken to be male warriors, and at closer quarters the Spaniards found them to be as brave as the men. Cortez, indeed, tried to induce his opponents to see how desperate their case was. His offers of peace were rejected; when envoys were sent it was always a signal for renewed attacks on the three Spanish camps.
After consultation with his captains Cuauhtemoc resolved to die fighting with his people rather than let them become the slaves of the Spaniards. The chief food of the inhabitants now was the green vegetation growing on the lake shallows, and they drank the saline water from the same source because fresh water was no longer to be had. Numerous must have been the victims of hunger and thirst and pestilence in the Aztec quarters, and great were the losses in the continued combats with an enemy far stronger, whose own losses were being made up by uninterrupted accessions of strength, while there was the whole countryside open from which supplies kept pouring in. It is significant that the success of the Aztecs in blocking the general assault of their capital made no impression outside. So far as we know, no attempts were made to break the Spanish investing lines, nor, on the other hand, did the failure to take the town in any way stop the movement to throw off the Aztec yoke which was plainly the prime motive on the part of the natives in helping the Europeans to take Mexico.
The siege had now lasted forty-five days; it was time, therefore, to make a radical change in the primitive methods of attack hitherto followed by Cortez, methods that recall the Homeric accounts of the siege of Troy. Each day there was hot fighting in the streets or on the lake where the Aztec canoes gathered about the brigantines. At nightfall there was a general return to the camp. The new plan was to destroy all the houses in the portion of the streets where the daily fighting took place. As the horsemen charged, the space was cleared and the work of destruction began. On the exposed part by the lake the brigantines and the canoes of the allies were able to do much effective damage. The scale of the operations is indicated in one of Cortez’ letters, where he speaks of using in this kind of fighting 150,000 warriors. Under these conditions, where each day ground for the next stage of occupation of the town was secured, the great market-place was taken.