In 1572 the two brothers of Setzen Khungtaidshi, named Buyandara Khulatshi Baghatur and Sain Dara Ching Baghatur, marched at the head of an army against Togmak, i.e., the Eastern Kiptchak.  On the Shira muran they encountered its ruler Aksar Khakan, and captured many prisoners and cattle.  Among the former was Chioki, a wife of Aksar Khakan.  As they returned home they were in turn attacked by Aksar, who had meanwhile assembled an army of 100,000 men.  A fierce battle ensued at the mountain Nitsugun Khassulak.  The Mongols at first broke the enemy's right wing.  Khulatshi Baghatur, one of their two chiefs, attacked the centre; his horse was killed under him, and while dismounted he was hit in the knee by an arrow, so that he fell and was over-ridden by his own men... (History of the Mongols, Howorth, pt.1, 1876)