First campaign

The initial British campaign was an attack on two fronts across a frontier of more than 1,500 km (930miles). In the eastern front, Major-General Bennet Marley and Major-General John Sullivan Wood led their respective columns across the Tarai towards the heart of the valley of Kathmandu. Further east, on the Sikkim border, Captain Latter led a small force in a primarily defensive role. Major-General Rollo Gillespie and Colonel David Ochterlony commanded the two columns in the western front. These columns were pitted against the cream of the Gorkha army under the command of Amar Singh Thapa. All four columns were composed mainly of Indian troops, though Ochterlony’s was the only column without a single British infantry battalion. The Commander-in-Chief of the British forces was Lord Moira.

The campaign started badly for the British. A day before the Governor-General officially declared war on 1 November 1814, General Gillespie had been killed trying to take the weakly-defended fort at Kalanga at the Battle of Nalapani. In the interval before Gillespie’s successor Major-General Gabriel Martindell took over command, Colonel Sebright Mawby managed to take Kalanga by cutting off its water supplies. Soon after Martindell arrived however, the British suffered further setbacks at the hands of Ranjur Singh Thapa(Amar Singh Thapa’s son), at the Battle of Jaithak. Martindell eventually reduced Jaithak to rubble with his guns but, even with vastly superior numbers, he failed to occupy it for fear of counter-attack.
The generals in the east mirrored this pusillanimity, with both Wood and Marley reluctant to face the enemy. After two attempts to advance on Butwal, Wood, with superior numbers, feebly retreated and took up a defensive posture at Gorakhpur. His compatriot, Major-General Marley, whose 8,000 strong force was supposed to provide the main striking force on Kathmandu, showed even more timidity. After his advance posts at Samanpore and Persa were wiped out due to lack of support, he was reduced to abject inactivity and, on 10 February 1815, deserted, "unable to endure the irksomeness of his situation ... took the sudden and extraordinary resolution in leaving the camp".

The company’s hopes now rested on the abilities of Colonel Ochterlony’s force of around 10,000 troops. Unlike the other generals, Ochterlony showed determination, skill and an ability to adapt to the circumstances. Although there were no initial decisive encounters, Ochterlony slowly pushed Amar Singh’s army higher and higher into the mountains until, in April 1815, the Gorkha general had been forced back into his main fort at Malaun.

The ensuing Battle of Dionthal was decisive. Attempts by Amar Singh’s most able lieutenant, Bhakti Thapa, to dislodge the British from the Dionthal ridge overlooking the Malaun fort failed. Although Bhakti Thapa was killed in the action on 16 April, the fort held out for a while. However, when news arrived announcing that Almora had fallen to Colonel Jasper Nicolls’ 2,000 strong force of regular sepoys on 26 April, Amar Singh Thapa realized the hopelessness of the situation and, threatened by the British guns, surrendered. In recognition of their heroic defences of their respective forts of Malaun and Jaithak, Ochterlony allowed Amar Singh and his son Ranjur (who had joined him at Malaun) to return home with their arms and men. During the campaign Ochterlony was promoted to major general.