Explanation:

• Mahatma Gandhi had called Non-Cooperation Movement his ‘Himalayan Blunder' after the incident of Chauri Chaura.
• Chauri Chaura is a town in the Gorakhpur district of Uttar Pradesh.
• On 4th February 1922, this town witnessed a violent incident. A large crowd of peasants set on fire a police station that killed 22 policemen.
• Due to this incident, Mahatma Gandhi called off the Non-Cooperation Movement (1920-22).
• It involved the use of swadeshi and boycott of foreign goods, especially machine-made cloth, and legal, educational, and administrative institutions, "refusing to assist a ruler who misrules".

• ?Chauri-Chaura -  4th February, 1922. 
• Kheda Satyagraha - 11th March 1918.
• Nagpur Satyagraha - 1923.
• Rajkot Satyagraha - 7th March 1939.