The snow was blinding as the Mongol archers encircled the Tartar raiding party. Each man guided his pony with his knees, standing on the stirrups to fire shaft after shaft with withering accuracy. They were grimly silent, the hooves of their galloping ponies the only sound to challenge the cries of the wounded and the howling wind. The Tartars could not escape the whirring death that came out of the darkening wings of the battle. Their horses fell groaning to their knees, blood spattering bright from their nostrils.

      On an outcrop of yellow-grey rock, Yesugei watched the battle, hunched deep into his furs. The wind was a roaring devil on the plain, tearing at his skin where it had lost its covering of mutton grease. He did not show the discomfort. He had borne it for so many years he could not have been sure he even felt it any more. It was just a fact of his life, like having warriors to ride at his word, or enemies to kill.

      The Tartars did not lack courage, for all he despised them. Yesugei saw them rally around a young warrior and heard his shouts carry over the wind. The Tartar wore a chain-mail vest that Yesugei envied, lusted after. With curt words of command, the man was preventing the raiders from scattering and Yesugei saw the moment had come to ride. His arban of nine companions felt it, the best of his tribe, blood brothers and bondsmen. They had earned the precious armour they wore, boiled leather inscribed with the leaping figure of a young wolf.

      ‘Are you ready, my brothers?’ he said, feeling them turn to him.

      One of the mares whinnied excitedly and his first warrior, Eeluk, chuckled.

      ‘We will kill them for you, little one,’ Eeluk said, rubbing her ears.

      Yesugei kicked in his heels and they broke effortlessly into a trot towards the screaming, roiling battlefield in the snow. From their height above the fighting, they could all see the full stretch of the wind. Yesugei murmured in awe as he saw the arms of the sky father reach around and around the frail warriors in great white scarves, heavy with ice.

      They moved into a gallop without the formation changing and without thought, as each man judged the distances around him as he had for decades. They thought only of how best to cut the enemy from their saddles and leave them cold on the plains.

      Yesugei’s arban crashed into the centre of the fighting men, making for the leader who had risen in the last few moments. If he was allowed to live, perhaps he would become a torch for all his tribe to follow. Yesugei smiled as his pony hammered into the first of the enemy. Not today.

      The impact broke the back of a Tartar warrior even as he turned to meet the new threat. Yesugei held his mount’s mane in one hand, using his sword in single strikes that left dead men falling like leaves. He refused two blows where the blade of his father might have been lost, instead using the pony to trample the men down and the hilt as a hammer for one unknown soldier. Then he was past and had reached the knotted core of the Tartar resistance. Yesugei’s nine followers were still with him, protecting their khan as they had been sworn from birth. He knew they were there without looking, guarding his back. He saw their presence in the way the Tartar captain’s eyes flickered to each