On 9 February 1930 part of the 4th Regiment of Tonkinese Rifles stationed at Yên Bái mutinied against their French officers but were suppressed by loyal troops from the same unit. The attack was the largest disturbance against the colonisation of Vietnam since the Cần Vương monarchist movement of the late 19th century. The aim of the revolt was to inspire a wider uprising among the general populace in an attempt to overthrow the colonial regime and establish independence. The Việt Nam Quốc Dân Đảng (VNQDĐ, the Vietnamese Nationalist Party) had previously attempted to engage in clandestine activities to undermine French rule, but increasing French scrutiny on their activities led to their leadership group taking the risk of staging a large scale military attack in the Red River Delta in northern Vietnam. This incident led to widespread disturbances against French rule across northeastern Vietnam during 1930–31.