While this fierce struggle was going forward, the Tlascalans, hearing the concerted signal, had advanced with quick pace into the city. They had bound, by order of Cortés, wreaths of sedge round their heads, that they might the more surely be distinguished from the Cholulans.[210] Coming up in the very heat of the engagement, they fell on the defenceless rear of the townsmen, who, trampled down under the heels of the Castilian cavalry on one side, and galled by their vindictive enemies on the other, could no longer maintain their ground. They gave way, some taking refuge in the nearest buildings, which, being partly of wood, were speedily set on fire. Others fled to the temples. One strong party, with a number of priests at its head, got possession of the great _teocalli_. There was a vulgar tradition, already alluded to, that on removal of part of the walls the god would send forth an inundation to overwhelm his enemies. The superstitious Cholulans with great difficulty succeeded in wrenching away some of the stones in the walls of the edifice. But dust, not water, followed. Their false god deserted them in the hour of need. In despair they flung themselves into the wooden turrets that crowned the temple, and poured down stones, javelins, and burning arrows on the Spaniards, as they climbed the great staircase which, by a flight of one hundred and twenty steps, sealed the face of the pyramid. But the fiery shower fell harmless on the steel bonnets of the Christians, while they availed themselves of the burning shafts to set fire to the wooden citadel, which was speedily wrapt in flames. Still the garrison held out, and though quarter, _it is said_, was offered, only one Cholulan availed himself of it. The rest threw themselves headlong from the parapet, or perished miserably in the flames.[211]