Sir Olaf Kirkpatrick Kruuse Caroe was an administrator in British India, working for the Indian Civil Service and the Indian Political Service. He served as the Foreign Secretary to the Government of India during the World War II and later as the Governor of the North-West Frontier Province. As Foreign Secretary, he was responsible for reviving the McMahon Line, which included the Assam Himalayan frontier within India. After retirement, Caroe took on the role of a strategist of the Great Game and the Cold War on the southern periphery of the Soviet Union. His ideas are believed to have been highly influential in shaping the post-War policies of Britain and the United States. Scholar Peter Brobst calls him the "quintessential master of the Great Game" and the "foremost strategic thinker of British India" in the years before indepndence.
In 1919, Caroe joined the Indian Civil Service, and soon moved to the Indian Political Service. He was influential in foreign policy and rose to be the Foreign Secretary to the Government of India, serving in that role through the World War II. When he was deputy foreign secretary, Caroe is credited with getting the Government of India to reaffirm the McMahon Line, which had been negotiated by a former Foreign Secretary Henry McMahon with Tibet in the Simla Convention of 1914. The McMahon Line ran along the crest of the Himalayan ranges east of Bhutan, and incorporated the present dayArunachal Pradesh within the territory of India. For various reasons, the Simla Convention was not operationalised until 1935, and the official publication of the treaties of the Government of India, Aitchison's Treaties, did not include it. Caroe obtained the British government's permission to revise the official Indian maps to show the McMahon Line as the new boundary and to include the Simla Convention in a revised volume of Aitchison's Treaties but to do so "unobtrusively". Caroe reissued the new volume in 1938, but still carrying the original 1929 date, and had the original volumes withdrawn. When the matter was discovered in 1963, it gave rise to accusation of a "virtual falsification" of the official records. Scholar Karunakar Gupta states that Caroe's zeal in operationalising the McMahon Line warrants it being renamed the "McMahon–Caroe Line". Caroe took a great interest in involving native Indian officials in foreign service and training them in diplomacy. Two of Caroe's officers rose to high ranks after independence: K. P. S. Menon, who became India's ambassador to China and Soviet Union as well as foreign secretary, and A. S. B. Shah, who headed Pakistan's Political Service and later went as ambassador to Egypt. After the war, Caroe was appointed as the Governor of the North-West Frontier Province, on the northwest border of the Indian subcontinent, adjoining Afghanistan and Russia. He served in this role from 1946 to just before the Partition of India in 1947. Subject to accusations that he was too close to the Muslim League, he encountered opposition from Congress Party politicians, and was replaced in mid-1947 by Rob Lockhart as governor.
Strategist
He wrote extensively after returning to Britain in 1947. His strategic ideas proved influential in the United States:
