When Kitchener went to India as commander-in-chief in November 1902, Birdwood joined him there as assistant military secretary and interpreter. He was promoted to the substantive rank of major on 9 May 1903 and appointed Military Secretary to Lord Kitchener with the rank of full colonel on 26 June 1905. Having been appointed an aide-de-camp to the King on 14 February 1906, he was given command of the Kohat Brigade on the North West Frontier in 1908 and promoted to temporary brigadier-general on 28 June 1909.