I replied that though it was not the Aztec habit to march and fight at night, such things were common enough among white men as they had seen already, and that because the Spaniards knew it was not their habit, they would be the more likely to attempt escape under cover of the darkness, when they thought their enemies asleep. Therefore I counselled that sentries should be set at all the entrances to every causeway. To this Cuitlahua assented, and assigned the causeway of Tlacopan to Guatemoc and myself, making us the guardians of its safety. That night Guatemoc and I, with some soldiers, went out towards midnight to visit the guard that we had placed upon the causeway. It was very dark and a fine rain fell, so that a man could see no further before his eyes than he can at evening through a Norfolk roke in autumn. We found and relieved the guard, which reported that all was quiet, and we were returning towards the great square when of a sudden I heard a dull sound as of thousands of men tramping. “Listen,” I said. “It is the Teules who escape,” whispered Guatemoc. Quickly we ran to where the street from the great square opens on to the causeway, and there even through the darkness and rain we caught the gleam of armour. Then I cried aloud in a great voice, “To arms! To arms! The Teules escape by the causeway of Tlacopan.” Instantly my words were caught up by the sentries and passed from post to post till the city rang with them. They were cried in every street and canal, they echoed from the roofs of houses, and among the summits of a hundred temples. The city awoke with a murmur, from the lake came the sound of water beaten by ten thousand oars, as though myriads of wild-fowl had sprung suddenly from their reedy beds. Here, there, and everywhere torches flashed out like falling stars, wild notes were blown on horns and shells, and above all arose the booming of the snakeskin drum which the priests upon the _teocalli_ beat furiously.