Professor Dr. Pran Gopal Datta participated in the election campaign of Mr. Zohor Ahmed Chowdhury and M A Aziz prior to the election of 1970 along with senior students of medical science against muslim league candidates. He use to compose the posters, leaflets in his own hand in favor of the candidates of his party. No sooner than the turmoil situation of 1970 was over, the struggle for freedom of 1971 has started.

He participated in the 1971 liberation war for our independence and fought tet-a -tet fight brilliantly.  He fought under the leadership of Sheikh Fazlul Haque Moni in the eastern sector at Tripura.  During the Liberation war Dr. Pran Gopal Datta was assigned with the responsibility of making correspondences with different agencies involved in liberation war inclusive of the government- in-exile.

He used to compose the letters dictated by Sheikh Fazlul Haque Moni directly to the ‘Mujib Bahini’ head of Indian government appointed Major General Uban, Swan Sing, Colonel Purakayastha and personal officer of Prime Minister Indira Gandhi. It was a part of our freedom struggle full of thrill, agony, pangs and pains depicted in these correspondences. Moreover, all these letters used to carry the message of orders, directives, list of materials, distribution situation of commodities-where to receive, how to deliver at the reach of the freedom fighters.By dint of his being acquainted with the personnel at the helm of affairs of liberation war at Mujib Nagar Dr. Pran Gopal Datta came in touch with personalities like Syed Nazrul Islam, Taz Uddin Ahmed, Tofael Ahmed, Sheikh Fazlul Haque Moni etc. In an interview with Syed Nazrul Islam accompanied by Sheikh Fazlul Haque Moni over a query he was introduced as the man responsible for making correspondences from Tripura to different offices inclusive of PM Indira Gandhi office and the planted Generals of Indian Army. Syed Nazrul Islam developed his interest in Dr. Pran Gopal Datta and asked Sheikh Fazlul Haque Moni to set him at his disposal for correspondences. Henceforth he used to take the dictation of Syed Nazrul Islam.His letters, copies of correspondences of the contemporary period written in his own hand are still preserved at the Fort William archives in Calcutta. Although he was in the battle field at Tripura his father and family members were still staying at village home at Chandina. The cruel persecutors Razakars took away his father in the torture cell and tortured him to death. Finding no other way to meet up the family need he found out a job after his father’s death. But could not continue in the job remembering his father’s desire to qualify himself as a doctor.