The state of society that arose out of this may be easily imagined. The warlike Arab tribes fought and brawled among themselves in ceaseless feud and strife. The negroes trembled in apprehension of capture, or rose locally against their oppressors. Occasionally an important Sheikh would effect the combination of many tribes, and a kingdom came into existence--a community consisting of a military class armed with guns and of multitudes of slaves, at once their servants and their merchandise, and sometimes trained as soldiers. The dominion might prosper viciously till it was overthrown by some more powerful league. All this was unheeded by the outer world, from which the Soudan is separated by the deserts, and it seemed that the slow, painful course of development would be unaided and uninterrupted. But at last the populations of Europe changed. Another civilisation reared itself above the ruins of Roman triumph and Mohammedan aspiration--a civilisation more powerful, more glorious, but no less aggressive. The impulse of conquest which hurried the French and English to Canada and the Indies, which sent the Dutch to the Cape and the Spaniards to Peru, spread to Africa and led the Egyptians to the Soudan. In the year 1819 Mohammed Ali, availing himself of the disorders alike as an excuse and an opportunity, sent his son Ismail up the Nile with a great army. The Arab tribes, torn by dissension, exhausted by thirty years of general war, and no longer inspired by their neglected religion, offered a weak resistance. Their slaves, having known the worst of life, were apathetic. The black aboriginals were silent and afraid. The whole vast territory was conquered with very little fighting, and the victorious army, leaving garrisons, returned in triumph to the Delta.