In 1904 a British expeditionary force occupied the Chumbi Valley for four years, in the border region adjacent to Bhutan and India. Sir Charles Bell was put in charge of the district from September 1904 to November 1905 and wrote that slavery was still practiced in Chumbi but had declined greatly over the previous thirty years. He noted that only a dozen or two dozen slaves remained, unlike nearby Bhutan where slavery was more widespread. Bell further remarked, "The slavery in the Chumpi valley was of a very mild type. If a slave was not well treated, it was easy for him to escape into Sikkim and British India."