During the war in Nepal in 1814, the British failed to annex Nepal as part of the Empire but Army officers were impressed by the tenacity of the Gurkha soldiers and encouraged them to volunteer for the East India Company.
Gurkhas served as troops of the East India Company in the Pindaree War of 1817, in Bharatpur in 1826, and the First and Second Sikh Wars in 1846 and 1848. During the Sepoy Mutiny in 1857, the Gurkha regiments remained loyal to the British, and became part of the British Indian Army on its formation. The 2nd Gurkha Rifles (The Sirmoor Rifles) defended Hindu Rao's house for over three months, losing 327 out of 490 men. The 60th King's Royal Rifle Corps (later part of the Royal Green Jackets) fought alongside the Sirmoor Rifles and were so impressed that following the mutiny they insisted 2nd GR be awarded the honours of adopting their distinctive rifle green uniforms with scarlet edgings and rifle regiment traditions and that they should hold the title of riflemen rather than sepoys. Twelve Gurkha regiments also took part in the relief of Lucknow. Gurkha regiments in the British Indian Army served in both World Wars