As their next chieftain they selected Cuauhtemoc, a cousin of Montezuma, a young man who, during the period of the Spanish occupation of Mexico, had distinguished himself by his active opposition to it. He had taken a leading rôle in the revolt that had brought about the evacuation of the capital, and he now set forward upon the work of defense with great intelligence. Orders were sent to the dependent pueblos to unite in repelling the European invasion, and the tribute was remitted. Care was taken to collect treasures and arms, and Mexico itself was placed in a state of defense by the construction of intrenchments and ditches. Cuauhtemoc’s plan of campaign consisted in concentrating all the available forces in the capital, yet offensive tactics were skilfully applied. His hand was seen when the Spaniards occupied Iztapalapa; here the inhabitants deserted the pueblo, and while their enemies were peacefully enjoying the spoil and resting in their quarters, the sluices were opened, and had not the natives of Texcoco warned Cortez in time all would have been drowned. Desultory warfare continued for a time on the shores of the lake, Cortez’ policy being to exact vengeance for the hostility of the lake pueblos during the retreat. Many were razed to the ground and burnt. But strenuous operations did not begin until the brigantines were finished. For their construction Cortez was indebted to the skill and industry of the people of Tlaxcala, who at their own expense cut the wood, and transported it over mountainous defiles by bad roads to their own pueblo, where it was cut into shape for the vessels. Thence the pieces were carried eighteen leagues overland to Texcoco on the lake, where, fastened together, they were transformed into ships ready for navigation. Futile attempts were made by the Aztecs to set fire to this navy, for they recognized the danger of an attack from the water, but there was no thought of surrender. Untiringly, night and day, they prepared for the siege, making new weapons to meet the attacks of cavalry, and constructing barricades in the streets. The Spaniards also had to do much preliminary work to enable the fleet to get into deep water; 8000 Indians were constantly employed in digging a channel from the shore sufficient to accommodate the draught of the brigantines. 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.