The regiment consists of primarily the Kirant Tribes Rai, Limbu, Yakkha, Sunuwar of Eastern Nepal, Darjeeling, Kalimpong, Dooars of West Bengal, Sikkim and other parts of Northeast India.

The regimental centre was subsequently shifted to Jalapahar in Darjeeling, and then moved to Clement Town, Dehradun for a brief period, and finally to Lucknow where it was firmly established.

The Bn stayed at Misamari only for a short duration of three months before moving to Durgapur and Burdwan districts of West Bengal for IS duties for conduct of state elections.

On the night of 03/ 04 Dec, when the Kirantis were spearheading their way to Buschi, the Battalion created history by capturing 06 Officers including the CO, 8 JCOs and 202 OR of 25 Baloch Frontier Force near Hilalnagar.

Subsequently, on 05 Dec, the Battalion led by C Coy under Maj NS Shekhawat cleared Mudafarganj town in a lightning day light attack and secured two important bridges.

The Kirantis showed utmost bravery and dedication when on 07 Dec 1971, Pak Army launched two Counter Attacks to siege the bridge and they were beaten back not once but twice.

On morning of 11 Dec 1971, the Pakistanis again tasted the metal of Khukri when an enemy gunboat carrying soldiers and a White Flag fired treacherously on the Bn when they were effecting a surrender.

The Meghna heli bridge was the first ever joint Air Force and Army operation since Independence and it greatly expedited the termination of hostilities.

The aim of the operation was to facilitate rapid movement of Indian troops over Meghna, as the existing bridges were destroyed by Pak forces to delay move of 4 Corps.

The Bn took up a daring task of establishing a bridge head across Meghna river in area Godnail so as to facilitate their infiltration up to Jalkhundi.

The Battalion was part of the deadliest thrust of 23 Infantry Division and 4 Corps operations and fulfilled all tasks allotted in ample manner.

[8] The battle honours of the regiment are Bogra, East Pakistan 1971, Shingo River Valley, Jammu and Kashmir 1971 and Batalik, Op Vijay J&K 1999.