Upon the outbreak of the
First Anglo-Sikh War in December 1845, Nicholson was serving as a staff officer in the commissariat department of
Sir Hugh Gough's field force which marched into the Punjab. In this role, Nicholson's main responsibility throughout the war was keeping Gough's force well supplied with provisions and ammunition. Following the decisive British victory at the
Battle of Sobraon in 1846, Nicholson was taken under the wing of
Henry Lawrence along with several other similarly aged officers such as
Herbert Edwardes,
James Abbott,
Neville Chamberlain,
Frederick Mackeson,
Patrick Alexander Vans Agnew,
William Hodson,
Reynell Taylor,
Harry Burnett Lumsden,
Henry Daly,
John Coke, this group was known as
Henry Lawrence's "Young Men". As part of this small band of young and driven men, Nicholson was given much power as a political officer on the North-West Frontier. His first posting in this new role was in July 1846 to the
princely state of
Jammu and Kashmir where he was to help solidify the rule of the British-installed
Maharaja,
Gulab Singh. Singh, however, was not a popular ruler in Kashmir and Nicholson took part in the suppression of a revolt against his rule. He spent the remainder of 1846 isolated in the
Kashmir Valley serving as the sole British advisor to Singh at his court in
Srinagar. To his relief, Nicholson was recalled to
Lahore by Lawrence in February 1847. Nicholson's next significant assignment was helping James Abbot win over the various tribes of the
Hazara region which he did by partaking in a daring nighttime raid against the
Tahirkheli tribe's mountain stronghold, after which Nicholson and Abbott would form a strong friendship. The murders of
Patrick Vans Agnew and Lieutenant William Anderson on 20 April 1848 signalled the beginning of a Punjab-wide Sikh rebellion which soon became the
Second Anglo-Sikh War. Initially, the East India Company was unprepared to deploy their army to the Punjab which meant that their political officers, including Nicholson, were completely isolated and effectively on their own in trying to maintain the British presence in the Punjab. It was in this vulnerable position that Nicholson was to display his soon to be characteristic nature of acting decisively and on his own initiative. He left Peshawar with a troop of irregular
Pakthun horsemen and rode straight for the vital fort at
Attock which, if controlled by the enemy, could sever the British line of communication. Upon arrival to the fort at first light, Nicholson rode straight past the stunned Sikh sentries guarding the main gate. When the Sikh sepoys further inside the fort raised their weapons against him, Nicholson leaped from his horse and wrestled the musket away from the nearest sepoy before shouting at them to lay down their arms and leave the fort, which the stunned Sikh garrison promptly did. This action, which was to become the first of Nicholson's famed exploits among the Sikhs, had enabled him to secure the vital fort without firing a single shot. Nicholson followed up this action just days later when he heard a Sikh infantry regiment were moving through the
Margalla Hills in order to join the rebellion. Nicholson left Attock with his trusted irregulars and met the Sikh force camped at a Muslim cemetery. Nicholson rode up to the enemy camp and demanded to speak with their Colonel whom he gave one hour to submit their loyalty to him and be spared or else be destroyed "to a man". The Sikhs argued for an hour in front of the imposing figure of Nicholson, who sat motionless on his horse for the entire duration. Upon the hour mark, the Sikhs returned to Nicholson and declared their willingness to submit to his authority, thus cementing the growing legend of Nicholson among the Sikh population. Nicholson and the rest of the British political officers throughout the Punjab spent the next few weeks attempting to fight the tide of the rebellion, but still awaiting support from Company troops and with the intervention of the Afghans into the conflict, they inevitably suffered a number of setbacks and Nicholson himself was seriously wounded while trying to storm a tower held by the Sikhs. By September 1848, Abbott and Nicholson were effectively on the run from the Sikh army and could only undertake limited action against them. However, with the arrival of the Company Field Army, which included Nicholson's younger brother Charles, to Lahore in November, the tide turned and the British were soon able to undertake offensive actions with Nicholson's irregular troops acting as the army's reconnaissance force and securing its supply lines. Nicholson fought in the subsequent
Battle of Chillianwala and witnessed the Sikhs' final surrender at the
Battle of Gujrat before being tasked to chase the retreating Afghan army all the way back to the Khyber Pass. Following the complete annexation of the Punjab under the administration of the East India Company, Nicholson was appointed the new Deputy Commissioner at
Rawalpindi. He soon set about imposing "law and order" in the region. In one incident, after placing a bounty on a particularly troublesome local robber chieftain failed to result in his arrest, Nicholson rode out alone to the man's village and demanded the chieftain surrender. When the chieftain refused this offer, Nicholson fought and killed him before decapitating his body. He then placed the man's head on his desk as a warning to all other criminals who may be tempted to commit similar violations. By 1849, Nicholson had spent ten years in India and was entitled to return home for a year's leave. During his time back in Europe, Nicholson served as the best man at his close friend Herbert Edwardes's wedding and travelled throughout Europe extensively. On his return to India in January 1852, Lawrence appointed Nicholson as the new Deputy Commissioner of the largely lawless
Bannu area. In this role, Nicholson was ruthless in bringing peace and order to the region with a zero tolerance attitude on crime or any perceived disrespect shown towards the colonial government, often using flogging or other similar methods to both punish and humiliate any who dared infringe the law. At first, he was feared for his foul temper and authoritarian manner which underpinned his tyrant-style rule, but Nicholson soon gained the respect of the Afghan and North Punjabi tribes in the area for his fairhandedness and sense of honour as well as his almost complete elimination of crime. The respect that Nicholson had first gained from the Sikh people and then the Punjabi tribes became religious worship as the "Nikal Seyn" cult developed, which worshiped Nicholson as a saint-like figure who brought justice to the oppressed by punishing the strong. Amazingly, this cult survived in surprising forms and ways in some remoter parts of North-West
Pakistan, into the 21st century. Rather than be flattered by this religious devotion, Nicholson found his Christian beliefs offended by the worship and would promptly whip any of the devotees who publicly practiced this cult in his presence. In 1855, at just the age of just thirty-four, Nicholson became the youngest brigadier-general in the Bengal Army. Nicholson was transferred to Peshawar in late 1856 to serve as the District Commissioner. ==Indian Mutiny==