Lords of the Bow — Conn Iggulden

For centuries, Mongol tribes had warred with one another. But now, under Genghis Khan, they have united as one nation, setting their sights on a common enemy: the great, slumbering walled empire of the Chin. Genghis will lead his warriors across the Gobi Desert and into a realm his people had never seen before -- with gleaming cities, soaring walls, and canals. Laying siege to one fortress after another, he will crush each enemy in a different way -- until his army faces the ultimate test of all.

In the city of Yenking -- modern-day Beijing -- the Chin will make their final stand, setting a trap for the Mongol raiders. confident behind their towering walls. But Genghis will strike with breathtaking audacity, never ceasing until the Emperor himself is forced to kneel.