East Turkestan Republic, officially known as the Turkish Islamic Republic of East Turkestan. Uyghurs joined with Uzbeks, Kazakhs, and Kyrgyz and successfully declared their independence on 12 November 1933. The First East Turkestan Republic was a short-lived attempt at independence around the areas encompassing Kashgar, Yarkent, and Khotan, and it was attacked during the Qumul Rebellion by a Chinese Muslim army under General Ma Zhancang and Ma Fuyuan and fell following the Battle of Kashgar (1934). The Soviets backed Chinese warlord Sheng Shicai's rule over East Turkestan/Xinjiang from 1934 to 1943. In April 1937, remnants of the First East Turkestan Republic launched an uprising known as the Islamic Rebellion in Xinjiang and briefly established an independent government, controlling areas from Atush, Kashgar, Yarkent, and even parts of Khotan, before it was crushed in October 1937, following Soviet intervention. Sheng Shicai purged 50,000 to 100,000 people, mostly Uyghurs, following this uprising. Second East Turkestan Republic The oppressive reign of Sheng Shicai fueled discontent by Uyghur and other Turkic peoples of the region, and Sheng expelled Soviet advisors following U.S. support for the Kuomintang of the Republic of China. This led the Soviets to capitalize on the Uyghur and other Turkic people's discontent in the region, culminating in their support of the Ili Rebellion in October 1944. The Ili Rebellion resulted in the establishment of the Second East Turkestan Republic on 12 November 1944, in the three districts of what is now the Ili Kazakh Autonomous Prefecture. Several pro-KMT Uyghurs like Isa Yusuf Alptekin, Memet Emin Bugra, and Mesut Sabri opposed the Second East Turkestan Republic and supported the Republic of China. In the summer of 1949, the Soviets purged the thirty top leaders of the Second East Turkestan Republic and its five top officials died in a mysterious plane crash on 27 August 1949. On 13 October 1949, the People's Liberation Army entered the region and the East Turkestan National Army was merged into the PLA's 5th Army Corps, leading to the official end of the Second East Turkestan Republic on 22 December 1949. Contemporary era Mao declared the founding of the People's Republic of China on 1 October 1949. He turned the Second East Turkistan Republic into the Ili Kazakh Autonomous Prefecture, and appointed Saifuddin Azizi as the region's first Communist Party governor. Many Republican loyalists fled into exile in Turkey and Western countries. The name Xinjiang was changed to