The formation of the Chushi Gangdruk Volunteer Force was announced on June 16, 1958. It was called National Volunteer Defence Army (NVDA). "Chushi Gangdruk" is a Tibetan phrase meaning "land of four rivers and six ranges," and refers to Amdo and Kham. The group included Tibetans from those regions of eastern Tibet, and its main objective was to drive PRC occupational forces out of Tibet. While central and western Tibet (Ü-Tsang) were bound by a 17-point agreement with the People's Republic of China, the PRC initiated land reform in eastern Tibet (including Amdo and Kham) and engaged in harsh reprisals against the Tibetan land-owners there.