<P> Lieutenant - General Sahabzada Yaqub Khan was sent into East Pakistan in emergency, following a major blow of the resignation of Vice Admiral Ahsan . General Yaqub temporarily assumed the control of the province, as he was made the unified commander of Pakistan Armed Forces . General Yaqub mobilised the entire major forces in East Pakistan, and were re-deployed in East Pakistan . </P> <P> Sheikh Mujibur Rahman made a declaration of independence at Dacca on 26 March 1971 . All major Awami League leaders including elected leaders of National Assembly and Provincial Assembly fled to neighbouring India and an exile government was formed headed by Mujibur Rahman . While he was in Pakistan Prison, Syed Nazrul Islam was the acting president with Tazuddin Ahmed as the prime minister . The exile government took oath on 17 April 1971 at Mujib Nagar, within East Pakistan territory of Kustia district and formally formed the government . Colonel MOG Osmani was appointed the Commander in Chief of Liberation Forces and whole East Pakistan was divided into eleven sectors headed by eleven sector commanders . All sector commanders were Bengali officers who had defected from the Pakistan Army . This started the Bangladesh Liberation War in which the freedom fighters, joined in December 1971 by 400,000 Indian soldiers, faced the Pakistani Armed Forces of 365,000 plus Paramilitary and collaborationist forces . An additional approximately 25,000 ill - equipped civilian volunteers and police forces also sided with the Pakistan Armed Forces . Bloody guerrilla warfare ensued in East Pakistan . </P> <P> The Pakistan Armed Forces were unable to counter such threats . Poorly trained and inexperienced in guerrilla tactics, Pakistan Armed Forces and their assets were defeated by the Bangladesh Liberation Forces . On April 1971, Lieutenant - General Tikka Khan succeeded General Yaqub Khan as Commander of unified forces . General Tikka Khan led the massive violent and massacre campaigns in the region . He is held responsible for killing hundreds of thousands of Bengali people in East Pakistan, mostly civilians and unarmed peoples . For his role, General Tikka Khan gained the title as "Butcher of Bengal". General Khan faced an international reaction against Pakistan, and therefore, General Tikka was removed as Commander of Eastern front . He installed a civilian administration under Abdul Motaleb Malik on 31 August 1971, which proved to be ineffective . However, during the meeting, with no high officers willing to assume the command of East Pakistan, Lieutenant - General Amir Abdullah Khan Niazi volunteered for the command of East Pakistan . Inexperienced and the large magnitude of this assignment, the government sent Vice-Admiral Mohammad Shariff as second - in - command of General Niazi . Admiral Shariff served as the deputy unified commander of Pakistan Armed Forces in East Pakistan . However, General Niazi proved to be a failure and ineffective ruler . Therefore, General Niazi and Air Marshal Enamul Haque, Commander of Eastern Air Force Command (EAFC), failed to launch any operation in East Pakistan against Indian or its allies . Except Admiral Shariff who continued to press pressure on Indian Navy until the end of the conflict . Admiral Shariff's effective plans made it nearly impossible for Indian Navy to land its naval forces on the shores of East Pakistan . The Indian Navy was unable to land forces in East Pakistan and the Pakistan Navy was still offering resistance . The Indian Army, entered East Pakistan from all three directions of the province . The Indian Navy then decided to wait near the Bay of Bengal until the Army reached the shore . </P> <P> The Indian Air Force dismantled the capability of Pakistan Air Force in East Pakistan . Air Marshal Enamul Haque, Commander of Eastern Air Force Command (EAFC), failed to offer any serious resistance to the actions of the Indian Air Force . For most part of the war, the IAF enjoyed complete dominance in the skies over East Pakistan . </P>

The ethnic bengals left pakistan in 1971 to form the country of