But soon the military officers of Bangladesh Forces realised that such non-planned attack or resistance will not be able to create huge casualties of the foes.
In this situation, senior military officers assumed that the war will continue for a long time and decided to form some brigades to fight against the Pakistani Army more effectively, especially in the frontiers.
[3] After the sector commanders' meeting held at 8, Theater Road of Kolkata, the first brigade of Bangladesh Forces was formed.
Of them the 1st Battalion of East Bengal Regiment, who revolted in Jessore Cantonment under Major Hafiz was unable to escape safely and after fighting a crucial battle[8] only fifty[5] of the Bengali officers and soldiers were able to reach the border.
Another 500 members collected by Major Shariful Haq Dalim amplified the strength of 3rd Battalion of East Bengal Regiment.
[8] Z force members were the highest among any force who were awarded the gallantry award for their heroism in the liberation war In bracket, highest rank reached in Bangladesh Army On 31 July 1971, Mukti Bahini under the command of Major Ziaur Rahman fought against the Pakistani troops stationed in Kamalpur.
The Mukti Bahini troops under the cover of supporting fire from Indian army almost reached to the mouth of Pakistani bunkers.
[11] Nakshi Border Outpost was situated in the Sherpur District, where the Pakistan Army formed a strong position.
But soon they attacked the freedom fighters with mortar shell with field mines also interrupting the operation of the 'Z Force' companies.
The Z Force also conducted some other significant operations including the battles of Bahadurabad, Dewanganj, Tengratila, Chilmari, Roumari, Hazipara, Chotokhal, Gowainghat, Gobindaganj, Shalutikor Airport, Dhalai Tea Garden, Sylhet, Jakiganj, Fultala, Borolekha etc.
B. Nurunnabi Khan of 3rd East Bengal Regiment, to establish an administration on behalf of the Provisional Government of Bangladesh.
Shafaat Jamil was asked to set up formidable defence to save the area from further invasion of Pakistan Army.
Lieutenant Nabi after getting the order, formed a committee of eminent citizens of that area to establish an administration and make it properly functional.