The Christians returned to their camp, deploring their imprudence and their credulity. This first reverse taught them that they could not reckon upon prodigies, and that they must, before they could expect to succeed, construct some machines of war. But it was difficult to procure the necessary wood in a country which presented nothing but barren sand and arid rocks. Several detachments were sent to search for wood in the neighbouring plains. Chance led them to the discovery of some immense beams in the depths of a cavern, and Tancred had them transported to the camp. They demolished all the houses and churches that had escaped the flames; and every stick of wood that the Saracens had not destroyed, was employed in the construction of the machines. Notwithstanding the discoveries, the work did not keep pace with the impatience of the Crusaders, or prevent the evils which threatened the Christian army. The great summer heats commenced at the very time the pilgrims arrived before Jerusalem. A blazing sun, and southern winds laden with the sands of the desert, heated the atmosphere to an intolerable degree. Plants and animals perished; the torrent of Cedron was dried up; all the cisterns around were either choked or poisoned. Beneath a sky of fire, in a burning and arid country, the Christian army soon found itself a prey to all the horrors of thirst. The fountain of Siloë, which only flowed at intervals, could not suffice for the multitude of pilgrims. A skin of fetid water, fetched three leagues, was worth two silver deniers. Overcome by thirst and heat, the soldiers were seen digging the soil with their swords, thrusting their hands into the freshly-turned earth, and eagerly carrying the humid particles to their parched lips. During the day, they anxiously looked for night; and during the night, panted for dawn, in the ever-disappointed hope that the return of the one or the other would bring some degree of freshness or some drops of rain. Every morning they were to be seen gluing their burning lips to the marbles which were covered with dew. During the heat of the day the most robust languished under their tents, without having even strength to implore Heaven for relief. The knights and barons were in no respect exempt from the scourge under which the army suffered; and many of them daily exchanged for water the treasures obtained from the infidels. “The grief of this extreme thirst,” says the old translator of William of Tyre, “was not so great for the foot soldiers as for the horsemen; the foot soldier could content himself with a little, but the horsemen could only satisfy their horses with copious draughts. As to the beasts of burden, there was no more account taken of them than of so many dead creatures; they were allowed to wander away at will, and died of thirst.”