The events of the revolution demonstrated that the Beiyang Army, which formed the core of the 36-division New Army, was absolutely the dominant military force within China. Controlling the fragmented loyalties of its formations was the key to political power in post–1911 China. The insurrection that actually set off the 1911 Revolution took place in Wuchang on 10 October. Four days later, the Qing court organized the New Armies in the north, and particularly the Beiyang Army, into three forces: the First Army, which would be sent to fight at Wuchang under the command of Army Minister Yinchang, the Second Army, which would act as a reserve force and would be sent to the front as needed, under the command of Feng Guozhang, and the Third Army, which would defend the capital, under Zaitao. The First and Second armies consisted of about 25,000 men each, or two divisions. The First included elements from the second, fourth, sixth divisions of the Beiyang army, which were the Qing government's crack troops, trained by Yuan Shikai.