The Liberation War of Bangladesh, The began on 26 March 1971 and ended with the liberation of Bangladesh on 16 December 1971. The armed struggle was the culmination of a series of events, situations and issues contributing to the progressively deteriorating relations between East and West Pakistan. The questions of land reforms, state language, inter-wing economic and administrative disparities, provincial autonomy, the defense of East Pakistan and many other consequential questions had been straining the relations between the two wings of Pakistan ever since independence of the country from Britain in 1947.

The general elections of 1970 had made sheikh mujibur rahman , the leader of the awami league which bagged 167 seats out of 169 allotted for East Pakistan, the sole spokesman of the people of East Pakistan and majority leader in the Pakistan National Assembly. But the Pakistan civil and military ruling clique had refused to transfer power to the majority leader Sheikh Mujibur Rahman and his party. Sheikh Mujib also refused to yield to the pressure put on him for undue accommodation. Sheikh's historic address on 7 March 1971 made this point quite clear to the Pakistani military junta. Then began the civil disobedience movement. Meanwhile talks started between Mujib and Yahya to resolve the outstanding issues. While holding talks, the Pakistani military junta was bringing more troops to Bangladesh and at the same time wantonly killing innocent civilians all over the country. This clearly showed that they were totally insincere about handing over power to the elected representatives of Bangladesh. No sooner the talks failed, the genocide began, with the Pakistan army's crackdown on the people of East Pakistan on the midnight of 25 March 1971. The Bengali soldiers serving in the then Pakistan Armed Forces and para militia forces declared instantly their solidarity with the people's liberation war.

During the liberation of Bangladesh, genocide occurred in 1971 and mass killing of Bangladesh people by Pakistan army and their collaborators during the  war of liberation in 1971. They killed 10 million of people of former East Pakistan (Bangladesh) and raped three hundred thousand of east Pakistani women within 9 month.