The Indo-Pakistani War of 1971 was the direct military confrontation between India and Pakistan during the Bangladesh Liberation War in 1971. Indian, Bangladeshi and international sources consider the beginning of the war to have been Operation Chengiz Khan, when Pakistan launched pre-emptive air strikes on 11 Indian airbases on 3 December 1971, leading to India's entry into the war of independence in East Pakistan on the side of Bangladeshi nationalist forces, and the commencement of hostilities with West Pakistan. Lasting just 13 days, it is considered to be one of the shortest wars in history.

During the course of the war, Indian and Pakistani forces clashed on the eastern and western fronts. The war effectively came to an end after the Eastern Command of the Pakistani Armed Forces signed the Instrument of Surrender, on 16 December 1971 in Dhaka, marking the liberation of the new nation of Bangladesh. East Pakistan had officially seceded from Pakistan on 26 March 1971. Between 90,000 and 93,000 members of the Pakistan Armed Forces including paramilitary personnel were taken as Prisoners of War by the Indian Army. It is estimated that between 300,000 and 3,000,000 civilians were killed in Bangladesh. As a result of the conflict, a further eight to ten million people fled the country at the time to seek refuge in neighbouring India.

Since the partition of British India in 1947 and creation of modern republics of India and Pakistan, the two South Asian countries have been involved in four wars, including one undeclared war, and many border skirmishes and military stand-offs.

The Kashmir issue has been the main cause, whether direct or indirect, of all major conflicts between the two countries with the exception of the Indo-Pakistani War of 1971 where conflict originated due to turmoil in erstwhile East Pakistan (now Bangladesh).

Background

The Partition of British India came about in the aftermath of World War II, when both Great Britain and British India were dealing with the economic stresses caused by the war and its demobilisation. It was the intention of those who wished for a Muslim state to come from British India to have a clean partition between independent and equal "Pakistan" and "Hindustan" once independence came.

The partition itself, according to leading politicians such as Mohammed Ali Jinnah, leader of the All India Muslim League, and Jawaharlal Nehru, leader of the Indian National Congress, should have resulted in peaceful relations. As the Hindu and Muslim populations were scattered unevenly in the whole country, the partition of British India into India and Pakistan in 1947 was not possible along religious lines. Nearly one third of the Muslim population of British India remained in India. Inter-communal violence between Hindus, Sikhs and Muslims resulted in between 500,000 to 1 million casualties.

The Kargil War (Hindi: करगिल युद्ध kargil yuddh, Urdu: کرگل جنگ ‎ kargil jang), also known as the Kargil conflict, was an armed conflict between India and Pakistan that took place between May and July 1999 in the Kargil district of Kashmir and elsewhere along the Line of Control (LOC). In India, the conflict is also referred to as Operation Vijay (Hindi: विजय, lit. "Victory") which was the name of the Indian operation to clear the Kargil sector.

The cause of the war was the infiltration of Pakistani soldiers and Kashmiri militants into positions on the Indian side of the LOC, which serves as the de facto border between the two states. During the initial stages of the war, Pakistan blamed the fighting entirely on independent Kashmiri insurgents, but documents left behind by casualties and later statements by Pakistan's Prime Minister and Chief of Army Staff showed involvement of Pakistani paramilitary forces, led by General Ashraf Rashid. The Indian Army, later on supported by the Indian Air Force, recaptured a majority of the positions on the Indian side of the LOC infiltrated by the Pakistani troops and militants. With international diplomatic opposition, the Pakistani forces withdrew from the remaining Indian positions along the LOC.

The Indo-Pakistani War of 1965 was a culmination of skirmishes that took place between April 1965 and September 1965 between Pakistan and India. The conflict began following Pakistan's Operation Gibraltar, which was designed to infiltrate forces into Jammu and Kashmir to precipitate an insurgency against Indian rule. India retaliated by launching a full-scale military attack on West Pakistan. The seventeen-day war caused thousands of casualties on both sides and also witnessed the largest tank battle since World War II. Hostilities between the two countries ended after a ceasefire was declared following diplomatic intervention by the Soviet Union and the United States, and the subsequent issuance of the Tashkent Declaration.

Though ruled to be militarily inconclusive, both India and Pakistan claimed victory. Most neutral assessments, however, agree that India had the upper hand over Pakistan when the ceasefire was declared. As Pakistan lost more territory than it gained during the war and failed to achieve its goal of capturing Kashmir, many impartial observers have viewed the result as a defeat for Pakistan and an Indian strategic victory.