"As many as you can construct," answered Roger, promptly. "Your own bows are useless against the Spanish armour, but a shaft from a crossbow will often penetrate, particularly if aimed at a vulnerable spot, or at the face. Then the men with the lances should be trained together, and put under a leader. It will be their task to charge down upon the Spaniards when they are gathering strongly, and particularly to meet the rush of the horsemen. Let them be armed with short swords or knives, and then, if the horsemen beat down the lances, the men should throw themselves on to the ground, and as the Spaniards pass, leap on their backs or drag them from the saddle." "The advice is good," said Guatemozin, thoughtfully. "The lances will hold the enemy back, while the crossbows will bring death to their ranks. But we must have some suggestion for the causeways. They will fight their way among those, and these brigantines will lie on one side and take us in the flank." This, in fact, was the very reason for their construction, for the wily Cortes had long ago seen that a powerful enemy could hold his men in check on the narrow causeway. If, however, he could keep their boats from the water, and could advance there himself, he would, with the help of his guns, be able to drive the enemy back, and so gain the causeway without much loss. "You cannot stop the brigantines if the water is deep," said Roger, after a while. "If shallow, you might drive in numbers of piles." "Then I fear that we must suffer, for the lake is very deep on either side of the causeway," answered the king. "And there is no time in which to make a big boat for ourselves, and we have no guns, and ammunition is not to be found. Then we must think of another plan, and decide when we see the actual spots. But I think that our best way will be to break down the causeway in numerous places, leaving wide chasms over which a plank or two can be placed till the Spaniards come. Then it ought to be made still wider. Let men be stationed all the way along in their canoes, and arm each boat with a couple of poles with hooks at the end. Then the canoes can dash in as the fighting is in full swing, and the men can drag the enemy into the water." For long they discussed their plans for the future, Roger's advice being received with the utmost respect. For it must be remembered that these natives had, for a couple of generations, been fighting with the same kind of arms as they now used, and against the same class of enemy. Their tactics, therefore, had required no alteration, and the coming of a new race with more effective arms and different methods had entirely nonplussed the Mexicans. There were few amongst them who had any new ideas, and by now they had proved the old ones to be useless. No wonder, therefore, that they received these new notions with every sign of approval, and begged Roger to put them into practice.