With the capture of the city and the death of the envoy the reason for the expedition disappeared. It remained only to withdraw the troops. The stores which had been brought across the desert at a terrible cost were thrown hastily into the Nile. The battered steamers which had waited so long at Metemma were hurriedly dismantled. The Camel Corps, their extraordinary efforts futile and their camels killed, marched back on foot to Korti. Their retreat was pressed by the exultant enemy. The River Column, whose boats after months of labour had just cleared the Cataracts, and who had gained a success at Kirbekan, were carried back swiftly by the strong current against which they had hopefully struggled. The whole Expeditionary Force--Guards, Highlanders, sailors, Hussars, Indian soldiers, Canadian voyageurs, mules, camels, and artillery--trooped back forlornly over the desert sands, and behind them the rising tide of barbarism followed swiftly, until the whole vast region was submerged. For several months the garrison of Kassala under a gallant Egyptian maintained a desperate resistance, but at last famine forced them to surrender, and they shared the fate of the garrisons of El Obeid, Darfur, Sobat, Tokar, Sinkat, Sennar, and Khartoum. The evacuation of the Soudan was thus completed. CHAPTER III: THE DERVISH EMPIRE It might seem at first a great advantage that the peoples of the Soudan, instead of being a multitude of wild, discordant tribes, should unite of their own accord into one strong community, actuated by a common spirit, living under fixed laws, and ruled by a single sovereign. But there is one form of centralised government which is almost entirely unprogressive and beyond all other forms costly and tyrannical--the rule of an army. Such a combination depends, not on the good faith and good will of its constituents, but on their discipline and almost mechanical obedience. Mutual fear, not mutual trust, promotes the co-operation of its individual members. History records many such dominations, ancient and modern, civilised or barbaric; and though education and culture may modify, they cannot change their predominant characteristics--a continual subordination of justice to expediency, an indifference to suffering, a disdain of ethical principles, a laxity of morals, and a complete ignorance of economics. The evil qualities of military hierarchies are always the same. The results of their rule are universally unfortunate. The degree may vary with time and place, but the political supremacy of an army always leads to the formation of a great centralised capital, to the consequent impoverishment of the provinces, to the degradation of the peaceful inhabitants through oppression and want, to the ruin of commerce, the decay of learning, and the ultimate demoralisation even of the military order through overbearing pride and sensual indulgence.