The Indo-Pakistani War of 1971 was a military conflict between India and Pakistan. Indian, Bangladeshi and international sources consider the beginning of the war to be Operation Chengiz Khan, Pakistan’s December 3, 1971 pre-emptive strike on 11 Indian airbases. Lasting just 13 days it is considered one of the shortest wars in history.
Here is a copy of the surrendering letter of Pakistani army in the war of 1976 when Indian army won against Pakistan and freed Bangladesh. More then 1 Lakh Pakistani soldiers surrendered to Indian Army.
After this war Bangladesh became an independent nation, the world’s third most populous Muslim state. Mujibur Rahman was released from a West Pakistani prison, returned to Dhaka on 10 January 1972 and to become first President of Bangladesh and later its Prime Minister.