In 1900, Climo accompanied his battalion to China to help put down the Boxer Rebellion, and fought at the relief of Peking and the battles of Peitsang and Yangtsun, being again mentioned in despatches in January 1901. He was second-in-command of his battalion during the British expedition to Tibet in 1903−1904 and in February 1905 was promoted to the substantive rank of major. In 1908, he served in the Mohmand expedition on the North-West Frontier and in the engagement at Kargha in May, and was mentioned in despatches for a third time in June 1908. On 22 June 1911, he was one of the Indian Army officers selected to represent the force at the coronation of King George V. In February 1912, he was promoted lieutenant-colonel and took command of the 24th Punjabis.