Rawalpindi
British

Following Rawalpindi's capture by the British East India Company, 53rd Regiment of the company army took quarters in the newly captured city. The decision to man a permanent military cantonment in the city was made in 1851 by the Marquess of Dalhousie.

The city saw its first telegraph office in the early 1850s. The city's Garrison Church was built shortly after in 1854, and is the site where Robert Milman, Bishop of Calcutta, was buried following his death in Rawalpindi in 1876. The city was home to 15,913 people in the 1855 census. During the 1857 Sepoy Mutiny, the area's Gakhars and Janjua tribes remained loyal to the British. Numerous civil and military buildings were built during the British era, and the Municipality of Rawalpindi was constituted in 1867, while the city's population as per the 1868 census was 19,228, with another 9,358 people residing in the city's cantonment.

The city was also connected to railways that offered connection to India and the northwest frontier in Peshawar in the 1880s. The Commissariat Steam Flour Mills were the first such mills in Punjab, and supplied most of the needs of British cantonments throughout Punjab. Rawalpindi's cantonment served as a feeder to other cantonments throughout the region.

Rawalpindi flourished as a commercial centre, though the city remained largely devoid of an industrial base during the British era. A large portion of Kashmir's external trade passing through the city; in 1885, 14% of Kashmir's exports, and 27% of its imports passed through the city. A large market was opened in central Rawalpindi in 1883 by Sardar Sujan Singh, while the British further developed a shopping district for the city's elite known as Saddar with an archway built to commemorate Brigadier General Massey.

Rawalpindi's cantonment became a major centre of military power of the Raj after an arsenal was established in 1883. Britain's army elevated the city from a small town, to the third largest city in Punjab by 1921. In 1868, 9,358 people lived in the city's cantonment – by 1891, the number rose to 37,870. In 1891, the city's population excluding the Cantonment was 34,153. The city was considered to be a favourite first posting for newly arrived soldiers from England, owing to the city's agreeable climate, and the nearby hill station of Murree.

In 1901, Rawalpindi was made the winter headquarters of the Northern Command and of the Rawalpindi military division. Riots broke out against British rule in 1905, following a famine in Punjab that peasants were led to believe was a deliberate act.

During World War I, Rawalpindi District "stood first" among districts in recruiting for the British war effort, with greater financial assistance from the British government channeled into the area in return.

By 1921, Rawalpindi's cantonment had overshadowed the city - Rawalpindi was one of seven cities of Punjab in which over half the population lived in the cantonment district. Communal riots erupted between Rawalpindi's Sikh and Muslim communities in 1926 after Sikhs refused to silence music from a procession that was passing in front of a mosque.

HMS Rawalpindi was launched as an ocean liner in 1925 by Harland and Wolff, the same company which built RMS Titanic. The ship was converted into an armed vessel, and was sunk in October 1939. Scientists from Porton Down carried out poison gas tests on British Indian Army soldiers during the Rawalpindi experiments over the course of more than a decade beginning in the 1930s.
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