Mukti Bahini consisted of the regular and the irregular forces. The regulars were later called 'Niomita Bahini' (regular force) and the irregulars were called 'Gono Bahini' (people's Force). The regulars included East Bengal Regiment and EPR troops. The irregular forces, which after initial training joined different sectors, consisted of the students, peasants, workers and political activists.
Irregular forces were inducted inside Bangladesh territory to adopt guerilla warfare against the enemy. The regular forces were engaged in fighting in conventional way. The first conventional brigade named as 'Z' Force was created in July. Major Ziaur Rahman was appointed commander of this brigade and the brigade was named as 'Z' Force after the first letter of his name. This brigade consisted of 1, 3 and 8 East Bengal.
Second regular brigade 'S' Force was created in October and consisted of 2 and 11 East Bengal. 'S' Force was named after the initial letter of the name of its commander Shafiullah. Similarly the 'K' Force created with 4, 9 and 10 East Bengal which was commanded by Khaled Mosharraf.
Teenagers at war
Similarly, Bangladesh Navy was also established with the Naval troops deserted from the Pakistan Navy. On 9 November 1971, the first naval fleet 'Bangabandhu Naubohar' consisting of six small ships was inaugurated. The command structure of the Bangladesh Forces was fully organised with the regular brigades, sector troops and guerilla forces, the Bangladesh Airforce and the Navy. The Mukti Bahini had fought many successful battles in putting up initial resistance.
But within a short time, they were temporarily contained by the Pakistan army and were compelled to withdraw to the safe sanctuary in the Indian territory. The Mukti Bahini was, however, re-equipped, reorganised and retrained. As a result, it got into fighting with fresh zeal after April-May 1971.
Pak prisoners captured by freedom fighters
At the international level, the United States and the People's Republic of China considered the crisis as an internal affair of Pakistan. On the other hand, India, Soviet Union and her allies and general masses in Japan, and Western countries stood solidly behind Bangladesh. In order to gain strategic advantage vis-a-vis Sino-US-Pakistan axis, Indo-Soviet Friendship Treaty was signed on 9 August 1971. It provided a new dimension to the War of Liberation.
Having realised that the Pakistan army could not be defeated by conventional warfare method, it was decided to create large guerilla forces all over the country. All Sector commanders were accordingly ordered to recruit, train and induct guerillas inside the country.