On his way back from the Crimea Gordon stopped at Constantinople, and while there a proposal was made to him, on the part of the sultan, to proceed to Egypt and to take service, with the queen's permission, under his vassal, the khedive, or ruler, as governor of the tribes in upper Egypt. Sir Samuel Baker had hitherto held the post, but now wished to resign, and Gordon, who had always laid greatly to heart the iniquity of the slave-trade, thought that, as governor of the provinces from which the supply of slaves was drawn, he might be able to put an end to it. Leave was granted in the autumn of 1873, and before Gordon returned to London to make the necessary preparations, he proceeded to Cairo to see the khedive, or, as he was still called, 'the lieutenant of the sultan.' * * * * * When Gordon accepted the position of 'governor of the equatorial provinces,' with a salary of L2,000 a year, instead of the L10,000 offered him by the khedive, the country, which ten years before had been rich and prosperous, was in a wretched condition owing to the slave-trade, carried on as long as they were able by Europeans as well as by Arabs. At first elephant-hunting was made the pretext of their expeditions, but soon they found negroes a more profitable article of commerce, and whole villages had the strong men and women torn away from them, till, at the first hint of the approach of a caravan, the people would abandon their huts and fly off to hide themselves. At length the trade became so well known and so scandalous that the Europeans were forced to give it up; but the Arab dealers continued to grow powerful and wealthy, and the wealthiest and most powerful of all was Zebehr, whose name for ever after was closely connected with that of Gordon. The slave-dealers soon formed themselves into a sort of league, with Zebehr at their head, and, having created an army made up of Arabs and of the slaves they had taken, refused to pay tribute to the khedive, or to acknowledge the supremacy of the sultan of Constantinople, whose viceroy he was. The Egyptian government, which had suffered the slave-trade to proceed unchecked when human life only was at stake, grew indignant the moment it became a question of money. An army was sent against Zebehr, who easily defeated it, and proclaimed himself ruler of the Soudan or 'land of the black,' south of Khartoum, then a little group of three thousand mud-houses on the left bank of the Blue Nile, three miles from its junction with the White Nile. But, small though it was, Khartoum was the capital of the province, and owned a governor's house, with the Blue Nile sheltering it on one side, and surrounded on the other three by a deep ditch and a wall, while on the west side the town was only half a mile distant from the White Nile itself.