Mukti Bahini in the context of "Simla Agreement"

The Bangladesh Liberation War (Bengali: মুক্তিযুদ্ধ, pronounced [mukt̪iɟud̪d̪ʱo]), 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.

In response to the violence, members of the Mukti Bahini—a guerrilla resistance movement formed by Bengali military, paramilitary and civilians—launched a mass guerrilla war against the Pakistani military, liberating numerous towns and cities in the war's initial months. At first, the Pakistan Army regained momentum during the monsoon, but Bengali guerrillas counterattacked by carrying out widespread sabotage, including through Operation Jackpot against the Pakistan Navy, while the nascent Bangladesh Air Force flew sorties against Pakistani military bases. India joined the war on 3 December 1971 in support of the Mukti Bahini, after Pakistan launched preemptive air strikes on northern India. The subsequent Indo-Pakistani War involved fighting on two fronts; with air supremacy achieved in the eastern theater and the rapid advance of the Allied Forces of Mukti Bahini and the Indian military, Pakistan surrendered in Dhaka on 16 December 1971, in what remains to date the largest surrender of armed personnel since the Second World War.

The Bangladesh genocide was the ethnic cleansing of Bengalis residing in East Pakistan (now Bangladesh) during the Bangladesh Liberation War, perpetrated by the Pakistan Army and the Razakars militia. It began on 25 March 1971, as Operation Searchlight was launched by West Pakistan (now Pakistan) to militarily subdue the Bengali population of East Pakistan; the Bengalis comprised the demographic majority and had been calling for independence from the Pakistani state. Seeking to curtail the Bengali self-determination movement, erstwhile Pakistani president Yahya Khan approved a large-scale military deployment, and in the nine-month-long conflict that ensued, Pakistani soldiers and local pro-Pakistan militias killed between 300,000 and 3,000,000 Bengalis and raped between 200,000 and 400,000 Bengali women in a systematic campaign of mass murder and genocidal sexual violence.

West Pakistanis in particular were shown by the news that the operation was carried out because of the 'rebellion by the East Pakistanis' and many activities at the time were hidden from them, including rape and ethnic cleansing of East Pakistanis by the Pakistani military. Although the majority of the victims were Bengali Muslims, Hindus were especially targeted. In their investigation of the genocide, the Geneva-based International Commission of Jurists concluded that Pakistan's campaign also involved the attempt to exterminate or forcibly remove a significant portion of the country's Hindu populace. The West Pakistani government, which had implemented discriminatory legislation in East Pakistan, asserted that Hindus were behind the Mukti Bahini (Bengali resistance fighters) revolt and that resolving the local "Hindu problem" would end the conflict—Khan's government and the Pakistani elite thus regarded the crackdown as a strategic policy. Genocidal rhetoric accompanied the campaign: Pakistani men believed that the sacrifice of Hindus was needed to fix the national malaise. In the countryside, Pakistan Army moved through villages and specifically asked for places where Hindus lived before burning them down. Hindus were identified by checking circumcision or by demanding the recitation of Muslim prayers. This also resulted in the migration of around eight million East Pakistani refugees into India, 80–90% of whom were Hindus.

Operation Jackpot (Bengali: অপারেশন জ্যাকপট) was a codename for three operations undertaken by the Mukti Bahini in East Pakistan (now Bangladesh) against Pakistan forces at the climax of the Bangladesh War of Independence.

After the Pakistani Army drove the Bengali armed militancy across the Indian border at the conclusion of Operation Searchlight, the Indian Army implemented a supply and training operation for the Mukti Bahini from 15 May 1971, with the goal of sending an ever increasing number of trained fighters to attack Pakistani forces and sabotage military and economic assets to demoralize Pakistani soldiers and disrupt their supply network. This enterprise was dubbed "Operation Jackpot".

The Indian Army had no standby force ready in 1971 with the specific task of attacking East Pakistan, one of the many reasons why India did not immediately intervene after Pakistan launched Operation Searchlight in March 1971. Indian Army's Eastern Command was tasked with defending the northern and eastern borders and fighting the insurgencies in Nagaland, Mizoram and Naxalites in West Bengal at that time.

Mukti Bahini, aided by the Indian army through Operation Jackpot, led the struggle against the Pakistan Army while the Indian Army readied for intervention. General M. A. G. Osmani, Commander-in-Chief Bangladesh Forces, had divided Mukti Bahini forces into 11 geographical sectors for command and control purpose. Mukti Bahini forces numbered 30,000 regular soldiers (including 3 brigades containing 8 infantry battalions and 3 artillery batteries) and at least 100,000 guerrillas by December 1971.

The Provisional Government of Bangladesh, popularly known as the Mujibnagar Government and also known as the Bangladeshi government-in-exile, was the first and founding government of Bangladesh that was established following the proclamation of independence of East Pakistan as Bangladesh on 10 April 1971. Headed by prime minister Tajuddin Ahmad, it was the supreme leadership of the liberation movement, comprising a cabinet, a diplomatic corps, an assembly, an armed force, and a radio service. It operated as a government-in-exile from Kolkata. The president of this government was Sheikh Mujibur Rahman, who is the main undisputed figure here; however, in his absence, Syed Nazrul Islam became the acting president.

After the 1970 general election, the military administration of Pakistan failed to hand over power to the elected legislators. When the Pakistan Army launched operations against separatists, the elected political leadership of East Pakistan declared independence and founded the provisional government with the support of the Government of India. Its cabinet took oath on 17 April 1971 in the town of Mujibnagar. It attracted many defectors from the Pakistani civil, diplomatic and military services and many leading intellectuals and cultural figures from East Pakistan.

The Razakars (Urdu: رضا کار Bengali: রাজাকার, lit. 'Volunteer') were a gendarmerie and paramilitary force in East Pakistan organised by General Tikka Khan in 1971. They were organised as a counter-insurgency force to fight Mukti Bahini members in the Bangladesh War of Independence, and played an infamous role in the 1971 Bangladesh genocide. The Razakars were disbanded following Pakistan's defeat and surrender in the 1971 Indo-Pakistani War.