"Tamerlane's [Timur's] conquering activities were carried on from the Volga to Damascus, from Smyrna to the Ganges and the Yulduz, and his expeditions into these regions followed no geographical order. He sped from Tashkent to Shiraz, from Tabriz to Khodzhent, as enemy aggression dictated; a campaign in Russia occurred between two in Persia, an expedition into Central Asia between two raids into the Caucasus.…[Timur] at the end of every successful campaign left the country without making any dispositions for its control except Khwarizm and Persia, and even there not until the very end. It is true that he slaughtered all his enemies as thoroughly and conscientiously as the great Mongol, and the pyramids of human heads left behind him as a warning example tell their own tale. Yet the survivors forgot the lesson given them and soon resumed secret or overt attempts at rebellion, so that it was all to do again. It appears too, that these blood soaked pyramids diverted [Timur] from the essential objective. Baghdad, Brussa (Bursa), Sarai, Kara Shahr, and Delhi were all sacked by him, but he did not overcome the Ottoman Empire, the Golden Horde, the khanate of Mogholistan, or the Indian Sultanate; and even the Jelairs of Iraq Arabi rose up again as soon as he had passed. Thus he had to conquer Khwarizm three times, the Ili six or seven times (without ever managing to hold it for longer than the duration of the campaign), eastern Persia twice, western Persia at least three times, in addition to waging two campaigns in Russia.…[Timur's] campaigns “always had to be fought again,” and fight them again he did."