Vamsharaj was made a
Kaji on Marwat policy in V.S. 1819 (1762 A.D.). On 20 January 1763, Vamsha Raj Pande won a battle against
Mir Qasim, the
Nawab of Bengal. On 14 April 1769 A.D., he was the army commander who led the Gorkhali attack in the
Battle of Bhaktapur. After consolidation of Kathmandu valley states, King
Prithvi Narayan Shah waged war against western
Chaubise (24) Confederacy on 1770 under the military leadership of Kaji Bamsharaj, Kaji
Kehar Singh Basnyat and
Sardar Prabhu Malla and achieved initial success. On 1771, the Gorkhali forces lost the war against Chaubise (24) principalities and Kaji
Kehar Singh Basnyat died on the battlefield. In the same war, Bamsharaj was captured by soldiers of Parbat Kingdom as war prisoner. His subordinate commanders Dhaukal Singh Basnyat and Sriharsha Pantha escaped with difficulty after the tough confrontation at Dhor. The document dated
Bikram Samvat 1833
Bhadra Vadi 3 Roj 6 (i.e. Friday 2 August 1776), shows that he had carried the title of
Dewan along with Swaroop Singh Karki. It was the time when he had just returned from the Parbat prison.
Chaubisi confederacy attacked Gorkha Kingdom on Sirhanchowk Gadhi (fort) at north and established their own position on 2 January 1782 A.D. Commander Garud Dhoj Pant of Tanahun Kingdom launched attack on Gorkhali side with combined army of Lamjung and Parbat and also included soldiers from Kaski, Palpa and Pyuthan.
Queen Rajendra Lakshmi Devi wanted ultimate destruction of trade route of Lamjung. Thus, Bamsharaj was called back from his exile in
Bettiah to launch attack on Lamjung Kingdom. Queen regent
Rajendra Laxmi Devi also called up exiled courtier and his rival Swaroop Singh Karki to attack on Lamjung Kingdom. A reconciliation was reached between both courtiers. Subsequently, Vamsharaj imposed economic blockade over Lamjung. Bamsharaj's youngest brother
Damodar Pande also took part in the attack. Vamsharaj had fought battles against Makwanpur, Timal and Sindhuli in 1762, Kirtipur in 1764, Chihan Danda in 1766, Tanahun in 1770, Pauwa Gadh in 1776, and Lamjung in 1783 A.D. ==Death at Bhandarkhal==