Bangladesh Liberation War and Indo-Pakistani War of 1971: The surrender of the Pakistan Army brings an end to both conflicts. This is commemorated annually as Victory Day in Bangladesh and Vijay Diwas in India respectively.

The Bangladesh Liberation War, also known as the Bangladesh War of Independence, was an armed conflict sparked by the rise of the Bengali nationalist and self-determination movement in East Pakistan, which resulted in the independence of Bangladesh. The war began when the Pakistani military junta based in West Pakistan—under the orders of Yahya Khan—launched Operation Searchlight against East Pakistanis on the night of 25 March 1971, initiating the Bangladesh genocide.

The Indo-Pakistani war of 1971, also known as the third Indo-Pakistani war, was a military confrontation between India and Pakistan that occurred during the Bangladesh Liberation War in East Pakistan from 3 December 1971 until the Pakistani capitulation in Dhaka on 16 December 1971. The war began with Pakistan's Operation Chengiz Khan, consisting of preemptive aerial strikes on eight Indian air stations. The strikes led to India declaring war on Pakistan, marking their entry into the war for East Pakistan's independence, on the side of Bengali nationalist forces. India's entry expanded the existing conflict with Indian and Pakistani forces engaging on both the eastern and western fronts.

The Pakistani Instrument of Surrender was a legal document signed between India and Pakistan to end the Bangladesh Liberation War and the Indo-Pakistani War of 1971. Per the trilateral agreement, the Pakistani government surrendered the Armed Forces Eastern Command, thereby enabling the establishment of the People's Republic of Bangladesh over the territory of East Pakistan. The document was signed by India's Lt. Gen Jagjit Singh Aurora and Pakistan's A. A. K. Niazi, and led to the surrender of 93,000 Pakistanis — the world's largest surrender in terms of number of personnel since World War II. Despite the agreement, Pakistan did not formally recognize Bangladeshi sovereignty until February 1974.