The Thái Nguyên uprising (Vietnamese: Khởi nghĩa Thái Nguyên) in 1917 has been described as the "largest and most destructive" anti-French rebellion in Vietnam (then part of French Indochina) between the Pacification of Tonkin in the 1880s and the Nghe-Tinh Revolt of 1930–31. On 30 August 1917, an eclectic band of political prisoners, common criminals and insubordinate prison guards mutinied at the Thai Nguyen Penitentiary, the largest one in the region. The rebels came from over thirty provinces and according to estimates, involved at some point roughly 300 civilians, 200 ex-prisoners and 130 prison guards.