Zebehr, encouraged by this military triumph, turned his arms against the Sultans of Darfour, who had incurred his resentment by placing an embargo on wheat during the course of his brief campaign with Bellal. This offensive action still further alarmed the Khedive Ismail, who was fully alive to the danger that might arise to his own position if a powerful military confederacy, under a capable chief, were ever organised in the Soudan. Instead of allying himself with the Darfourians, as would probably have been the more politic course, Ismail decided to invade their territory simultaneously with Zebehr. Several battles were fought, and one after another the Sultans of Darfour, whose dynasty had reigned for 400 years, were overthrown and slain. Zebehr received in succession the Turkish titles of Bey and Pasha, but he was not satisfied, for he said that as he had done all the fighting, he ought to receive the Governor-Generalship of Darfour. If he failed to win that title from the Khedive, he succeeded in gratifying a more profitable desire, by leading off into slavery the larger half of the population of Darfour. He was still engaged in this pursuit at the time of Gordon's appearance on the scene, and the force at his disposal was thus described by that officer: "Smart, dapper-looking fellows, like antelopes, fierce, unsparing, the terror of Central Africa, having a prestige far beyond that of the Government--these are the slave-dealers' tools," and afterwards they no doubt became the main phalanx of the Mahdi's military system.