Dalbhanjan followed the King Rana Bahadur Shah into exile to Banaras along with Bhimsen Thapa and the Senior Queen Raj Rajeshwari Devi. In July 1804, he along with Badakaji Amar Singh Thapa informed the Company's in-charge "Daroga" about the orders of takeover of Butwal plains and honor Palpa's former obligations from the King of Gorkha. After 1806, the territories of Palpa were kept under the military governorship of him and Bada Amar Singh Thapa. In 1806, he was deputed to Kangra Fort along with Rudra Vir Shah as senior military officers after the death of Kaji Nain Singh Thapa in the conquest. He was one of the senior Bharadars to have opposed the Anglo-Nepalese War due to prevalence of weak administration in the western front suggesting a possible revolt from the citizens of the newly conquered west. He was among the seniormost officials who reported to Mukhtiyar Bhimsen Thapa from Makwanpur axis along with Ranabir Singh Thapa during the Anglo-Nepalese War. He left for Peking in 1822 leading the seventh Quinquennial mission to China.