What is the title of this article:

When an ally of the U-Tsang ruler threatened destruction of the Gelugpas again, the fifth Dalai Lama Lozang Gyatso pleaded for help from the Mongol prince Gushi Khan (15821655), leader of the Khoshut (Qoshot) tribe of the Oirat Mongols, who was then on a pilgrimage to Lhasa. Gushi Khan accepted his role as protector, and from 16371640 he not only defeated the Gelugpas' enemies in the Amdo and Kham regions, but also resettled his entire tribe into Amdo. Sonam Chopel urged Gushi Khan to assault the U-Tsang king's homebase of Shigatse, which Gushi Khan agreed upon, enlisting the aid of Gelug monks and supporters. In 1642, after a year's siege of Shigatse, the U-Tsang forces surrendered. Gushi Khan then captured and summarily executed Karma Tenkyong, the ruler of U-Tsang, King of Tibet.

Title:
Sino-Tibetan relations during the Ming dynasty