The Bangladesh Liberation War (Bengali: Muktijuddho) was an armed conflict pitting West Pakistan against East Pakistan (two halves of one country) and India. The war resulted in the secession of East Pakistan, which became the independent nation of Bangladesh.
On 16 December 1971, the allied forces of the Indian army and the Mukti Bahini decisively defeated the West Pakistani forces deployed in the East. The resulting surrender was the largest in number of prisoners of war since World War II.
Here is the list of Bengali Patriotic Songs or MuktiJudder Gaan: