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On 4 April, the senior officers of the liberation army assembled at the headquarters of 2nd East Bengal at Teliapara, a semi hilly area covered by tea gardens where Colonel MAG Osmany, Lieutenant Colonel Abdur Rob, Lieutenant Colonel Salahuddin Mohammad Reja, Major Kazi Nuruzzaman, Major khaled mosharraf, Major Nurul Islam, Major Shafat Jamil, Major Mainul Hossain Chowdhury and others were present. In this meeting four senior commanders were entrusted with the responsibility of operational areas. Sylhet-Brahmanbaria area was placed under the command of Major Shafiullah. Comilla-Noakhali area was given to Major Khaled Mosharraf while Chittagong-Chittagong Hill Tracts was given to Major Ziaur Rahman. Kushtia-Jessore area was placed under command of Major Abu Osman Chowdhury. In the meeting the organisational concept of the freedom fighter forces and the command structure were chalked out. Colonel MAG Osmany was to command the liberation forces, later named as mukti bahini.
An exile government called the People's Republic of Bangladesh alias mujibnagar government headed by tajuddin ahmed was formed on 10 April. On the next day Tajuddin Ahmed announced the names of three more regional commanders. Captain Newazish for Rangpur region, Major Najmul Haque for Dinajpur-Rajshahi-Pabna and Major Jalil for Barisal-Patuakhali region. All these regions were later named as sectors. All of Bangladesh was divided into eleven such sectors and different sub-sectors for operational purposes during the Sector Commander's conference held from 10 to 17 July 1971.
On 27 March, Prime Minister of India Mrs. Indira Gandhi expressed full support of her government to the freedom struggle of the Bengalis. Indian Border Security Force (BSF) opened Bangladesh-India border to allow the tortured and panick stricken Bengalis to have safe shelter in India. The governments of West Bengal, Bihar, Assam, Meghalaya and Tripura established refugee camps along the border. These camps became ready ground for recruitment of the freedom fighters. The students, peasants, workers and political activists joined the Mukti Bahini with high spirit to liberate Bangladesh from the Pakistan army. They were given training on tactics and the use of arms and explosives.
| On completion of training, they were posted to different sectors to fight the enemy. The headquarters of the Bangladesh Forces was established at 8 Theatre Road, Calcutta which started functioning from 12 April 1971. Lieutenant Colonel M A Rab and Group Captain A K Khandaker were appointed as Chief of Staff and Deputy Chief of Staff respectively |  Refugees, 1971 |
Besides Mukti Bahini, many other bahinis were organised inside Bangladesh at different places to fight Pakistan Army. These Bahinis included Kader Bahini of Tangail, Latif Mirza Bahini of Sirajganj, Akbar Hossain Bahini of Jhinaidah, Hemayet Bahini of Faridpur, Quddus Molla and Gafur Bahini of Barisal, Afsar Bahini of Mymensingh and Aftab Bahini of Mymensingh.
| A crack platoon consisting of daring youths operated most valiantly in Dhaka city as well. These bahinis were established as a local force based on their own strength taking part in a number of battles with the occupation army. Siraj Sikdar, leader of Sorbohara Party, also organised his force in Barisal. |  Freedom fighters taking training |