The Chittagong armoury raid was carried out on 18 April 1930. Kalpana joined the "Indian Republican Army, Chattagram branch", the armed resistance group led by Surya Sen in May 1931. In September, 1931 Surya Sen entrusted her along with Pritilata Waddedar to attack the European Club in Chittagong. But a week before the attack, she was arrested while carrying out reconnaissance of the area. She went underground after her release on bail. On 17 February 1933the police encircled their hiding place in gairila village, and that raid Surya Sen was arrested but Kalpana was able to escape from there. She was finally arrested on 19 May 1933. In the second supplementary trial of the Chittagong armoury raid case, Kalpana was sentenced to transportation for life. She was released in 1939.
Later life
Kalpana Datta graduated from the Calcutta University in 1940 and joined the Communist Party of India. She served as a relief worker during the 1943 Bengal famine and during the Partition of Bengal. She wrote an autobiographical book in Bengali "চট্টগ্রাম অস্ত্রাগার আক্রমণকারীদের স্মৃতিকথা" which was translated into English by Arun Bose & Nikhil Chakraborty with a preface by Com. P. C. Joshi, a communist leader & her husband as "Chittagong Armoury Raiders: Reminiscences", published in English in October 1945. In 1946, she contested in the elections for the Bengal Legislative Assembly as a Communist Party of India candidate from Chittagong but could not win. Later, she joined the Indian Statistical Institute where she worked until her retirement. She died in Calcutta on 8 February 1995.
Personal life
In 1943, she married the then General Secretary of the Communist Party of India, Puran Chand Joshi. They had two sons: Chand and Suraj. Chand Joshi was a noted journalist, who worked for the Hindustan Times. He was also known for his work, Bhindranwale: Myth and Reality. Chand's wife Manini penned a book on the Chattagram armoury raid, titled, Do and Die: The Chattagram Uprising 1930-34''.
Artistic depictions
In 2010, Deepika Padukone starred as Kalpana Datta and Abhishek Bachchan starred as Suryja Sen, in a Hindi movie, Khelein Hum Jee Jaan Sey, which dealt with the Chittagong armoury raid and its aftermath. Another movie, Chittagong, was released on 12 October 2012, based on the uprising. It was produced and directed by Bedabrata Pain, an ex-NASA scientist.