Within the Khanate, Erdeni Batur set out on an ambition campaign of empire building activities. For instance, he established the
capital city of the Dzungar Khanate, the city of modern-day
Yining with a monastery called Khobak Sari south of
Lake Zaisan on the
Emil River, near the modern city of
Tacheng, and built monasteries throughout Dzungar territory. He also promoted Buddhism to his subjects such as the
Clear Script, and encouraged them to resettle to the new capital on the new monastery as new buildings were constructed. He also assisted
Güshi Khan and his brother, Kundulun Ubashi, to move a substantial part of the
Khoshut-Oirat tribe from the Lake Zaisan area to the area around
Qinghai Lake – what the Mongols call Kokonoor and the Tibetans called
Amdo – in 1636, where they soon would establish the
Khoshut Khanate.
War against the Kazakhs In 1635, Erdeni batur invaded the
Kazakh Khanate, and captured
Jangir Khan at the
Ili river defeating
Uzbek relief forces. However his army was soon defeated at the
Battle of Orbulaq, facing a large counterinvasion force of 22,600 men, losing heavy casualties of around ten thousand men. In 1646, he attempted another invasion against the Kazakhs, capturing
Sairam and Turkistan as well forcing the Kazakhs and Kyrgyz civilians into a vassalage. But soon Bukharans relieved the captured cities and with another defeat, he requested for Khoshut assistance, with sending Ochirtu Khan's son Galdamba to fight the Kazakhs. ==Decline and death==