During the British Raj, Darjeeling's temperate climate led to its development as a hill station for British residents seeking to escape the summer heat of the plains. The development of Darjeeling as a sanatorium and health resort proceeded briskly. Arthur Campbell, a surgeon with the company, and Lieutenant Robert Napier were responsible for establishing a hill station there. Campbell's efforts to develop the station, attract immigrants to cultivate the slopes and stimulate trade resulted in a hundredfold increase in the population of Darjeeling between 1835 and 1849. The first road connecting the town with the plains was constructed between 1839 and 1842. In 1848, a military depot was set up for British soldiers, and the town became a municipality in 1850.