The regiment was primarily used to police the border with Nepal, doing so for many decades until the Indian Mutiny began in 1857. The battalion was actively involved in the efforts to quell it. During the Siege of Delhi - which lasted from March to September 1857 - the regiment, part of Colonel Colin Campbell's Third Column, took part in the storming of Kashmir Gate and gained the Battle Honour "Delhi 1857". The mutiny was quelled by July 1858.
The regiment, having been brought into the line of the Bengal Army, was briefly titled the 18th Bengal Native Infantry in 1861 before the regiment gained its present numeral designation when it became the 3rd Goorka (The Kumaon) Regiment. The regiment saw service in an expedition to Bhutan shortly after the name change.
In 1878 the Second Afghan War began and the regiment, as part of the 2nd Infantry Brigade of the Kandahar Field Force, took part in the march to seize Kandahar. The field force successfully captured the city on 8 January 1879, having experienced great hardship on the march there. The following year the Kandahar Force began the march towards the Afghan capital Kabul to join Major-General Roberts force in an attempt to consolidate their situation in the country. During the journey, near Ghaziri, the force were attacked by a large force of Afghan tribesmen at Ahmad Khel on 19 April 1880. The fighting that ensued was intense and the field force's situation was in the balance until the Afghan forces were successfully repulsed when the 3rd Goorkhas formed an infantry square.
The 3rd Gurkhas took part in numerous campaigns in the volatile North-West Frontier, including the 1st Battalion's participation in the storming of the Dargai Heights on 20 October 1897 during the Tirah Campaign. The battalion was part of the Tirah Field Force intended to put down a large tribal revolt by the Afridi and Orakzais, orchestrated by Afghanistan. The 3rd Gurkhas took part in the advance into the Tirah Region, meeting resistance from tribal forces before moving on to help relieve Fort Lockheart and Fort Gulistan. After this was done the force marched on Dargai where they intended to take the heights above Dargai, controlled by tribal forces.
The heights had originally been taken by the Tirah force on 18 October but they were ordered to withdraw, coming under attack as they did so and allowing the tribal force to return to the heights and strengthen their positions. The operation to retake the heights began with an artillery bombardment at 10:00am on 20 October. The regiment took part in the initial assault, positioned at the forefront of the attack with the 2nd Gurkha Rifles and the 1st Dorsets. They advanced methodically, moving up the slopes until they charged towards the enemy but sustained heavy casualties and became pinned down. The battle raged on for hours until, after the tribal positions were subject to an artillery bombardment, a final charge was made by the 1st Gordons, followed by the Gurkhas and 3rd Sikhs. The tribal defenders wilted in the face of the charge and the heights were taken later that day.
In 1907 the title was changed to become the 3rd The Queen's Own Gurkha Rifles in honour of Alexandra of Denmark, queen consort of King Edward VII, and the following year the title became more specific when it became the 3rd Queen Alexandra's Own Gurkha Rifles.
In 1916, a clerical error gave the regiment a 4th Battalion when 4/3rd, instead of 3/4th, was written on the order for the raising of a battalion for the 4th Gurkha Rifles. The following year a 3rd Battalion for the 3rd Gurkhas was formed.
The battalion's first large-scale action came at La Bassée that had commenced on 12 October as part of a period known as the "Race to the Sea". The battalion was involved in the defence of Festubert in November and Givenchy in December, during a bitter winter that the Gurkhas were no doubt unaccustomed to having spent the inter-war period on the sub-continent,
The battalion remained on the Western Front until late 1915. At the Battle of Neuve Chapelle (10-13 March) the Garwhal Brigade advanced successfully during the initial offensive and the 1st Battalion took part in fierce fighting during the battle. In May it was involved in the battles of Festubert and Aubers. In September the battalion took part in the Battle of Loos which saw the regiment awarded its first Victoria Cross. The VC action took place on 25 September when rifleman Kulbir Thapa of the 2nd Battalion performed with distinction near the village of Fauqissart, becoming the first Gurkha recipient of the award.
The Battle of Loos was the battalion's last action on the Western Front and it left the 7th Division with the rest of the Garhwal Brigade for Egypt in December 1915 after the brigade became an independent unit.
On 10 April 1918 at El Kefr in Egypt, Karanbahadur Rana of the 2nd Battalion became the regiment's second VC recipient afterr distingishuing himself in an encounter with Ottoman forces, and was the last VC recipient of the regiment.
Elsewhere the 1st Battalion, from 1917, took part in the Mesopotamian Campaign (now Iraq), gaining only a single Battle Honour in the process. It was achieved at the last battle of the campaign, at the Battle of Sharqat (28-30 October 1918).
The Regiment won the Battle Honour 'Pir Kanthi' in the Uri Sector in 1948 and 'Shingo' in the Kargil Sector in 1971. 1/3 GR has the distinction of being the first battalion in the post-independence period to carry out amphibious operations during the 1971 Indo-Pak War. Colonel J.R. Chitnis, CO 1/3 GR, was honoured with the Ashoka Chakra posthumously - India's highest peacetime medal for valour - in Nagaland in 1956.
On December 3 1997, a statue was unveiled in London in honour of the Gurkhas. A quote from Sir Ralph Turner, a former officer in the 3rd Gurkhas, was inscribed on the memorial: "Bravest of the brave, most generous of the generous, never had country more faithful friends than you."