He became the Governor (Bada Hakim) and the commander of armed forces deployed in Palpa administrative sector in 1814 AD on substitute of his grandfather Amar Singh Thapa (sanukaji) who died that year.

He was Colonel[note 1] in the ranks of Nepalese Army and was awarded an official private black seal which can be seen in the letter of 1821 A.D. to the Mukhtiyar Bhimsen Thapa.

[7]Before entering the war, Ujir Singh had constructed roads, bridges, culverts and fortified garrisons in the Butwal-Palpa region.

While crossing Tinau River to attack the fortress Ujir's forces opened the fire and made them fall back.

Ujir Singh then touched the feet of a 16 handed Mahishashur Mardini Bhagwati deity in Tansen Bazaar and took solemn vow to spread her fame by constructing a temple and initiating a Sindoor Jatra (procession of vermillion) upon the victory of Gorkhali forces in the war.

[10] On Friday 7 April 2017, the Chief of Army Staff (Nepal) Rajendra Chhetri unveiled the life-size statue of Ujir Singh at Tansen, Palpa.

[5] The statue was constructed jointly by the Palpa Chambers of Commerce and Industry and the Chandi Prasad Battalion of Nepal Army.

[5] Another life-size statue of Ujir Singh and the largest national flag of Nepal was also planned to be installed at the Jitgadhi Killa fort which is located at the Western bank of Tinau River in Butwal.