From an account of the British liberation of Palestine by Major V. Gilbert in The Last Crusade, quoted in Christ's Call To Discipleship, J.M. Boice, Moody, 1986, p. 143
Driving up from Beersheba, a combined force of British, Australians and New Zealanders were pressing on the rear of the Turkish retreat over arid desert. The attack outdistanced its water carrying camel train. Water bottles were empty. The sun blazed pitilessly out of a sky where the vultures wheeled expectantly. "Our heads ached," writes Gilbert, "and our eyes became bloodshot and dim in the blinding glare...Our tongues began to swell...Our lips turned a purplish black and burst."
Those who dropped out of the column were never seen again, but the desperate force battled on to Sheria. There were wells at Sheria, and had they been unable to take the place by nightfall, thousands were doomed to die of thirst. "We fought that day," writes Gilbert, "as men fight for their lives... We entered Sheria station on the heels of the retreating Turks. The first objects which met our view were the great stone cisterns full of cold, clear, drinking water. In the still night air the sound of water running into the tanks could be distinctly heard, maddening in its nearness; yet not a man murmured when orders were given for the battalions to fall in, two deep, facing the cisterns"
He then describes the stern priorities: the wounded, those on guard duty, then company by company. It took four hours before the last man had his drink of water, and in all that time they had been standing twenty feet from a low stone wall on the other side of which were thousands of gallons of water.