But as he approached the bottom he saw two of these sentinels walking back and forth, their bayonets reflecting a flicker now and then from the flames. He saw also five or six large white tents, and he was quite sure that the largest sheltered at that instant Martin Perfecto de Cos, whom he wished very much to avoid. He intended, when he reached the bottom, to keep as close as he could in the shadow of the pyramid, and then seek the other side of the Teotihuacan. The rain was still blown about by the wind, and it was very cold. But the influence of both wind and rain were inspiring to the boy. They were a tonic to body and mind, and he grew bolder as he came nearer to the ground. At last he stepped upon the level earth, and stood for a little while black and motionless against the pyramid. He was aware that the cordon of Cos' army completely enclosed the Pyramid of the Moon, the Pyramid of the Sun, the Calle de los Muertos and the other principal ruins, and he now heard the sentinels much more distinctly as they walked back and forth. Straining his eyes he could see two of them, short, sallow men, musket on shoulder. The beat of one lay directly across the path that he had chosen, reaching from the far edge of the Pyramid of the Moon to a point about twenty yards away. He believed that when this sentinel marched to the other end of his beat he could slip by. At any rate, if he were seen he might make a successful flight, and he slipped his hand to the handle of the machete in his belt in order that he might be ready for resistance. He saw presently two or three dark heaps near him, and as his eyes grew used to the darkness he made out camp equipage and supplies. The smallest heap which was also nearest to him, consisted of large metal canteens for water, such as soldiers of that day carried. His thirst suddenly made itself manifest again. Doubtless those canteens contained water, and his body which wanted water so badly cried aloud for it. It was not recklessness but a burning thirst which caused him to creep toward the little heap of canteens at the imminent risk of being discovered. When he reached them he lay flat on the ground and took one from the top. He knew by its lack of weight that it was empty, and he laid it aside. Then he paused for a glance at the sentinel who was still walking steadily on his beat, and whom he now saw very clearly.