Solution:Gandhiji called off the non-cooperation movement in 1922. The Non-Cooperation movement led by Gandhiji demanded non-violent, peaceful protest against the British Raj. But the spread of Non-Cooperation across nations and the assimilation of different entities led to change in its course, and it turned violent in many places. One such event was in Chauri Chaura, a village in Gorakhpur, where a peaceful demonstration turned violent after police intervention, and the protestors set fire to the police station. Hearing of the event, Gandhi called for a halt to the Non-Cooperation movement. Gandhi felt that satyagrahis needed to be trained before launching a mass struggle.