After securing a militia commission in the 4th Battalion
Royal Scots Fusiliers in 1883, which he resigned in March 1885, Birdwood then trained at the
Royal Military College, Sandhurst, from which he was commissioned early, owing to the Russian war scare of 1885, becoming a
lieutenant in the
12th (Prince of Wales's) Royal Lancers on 9 May 1885. He joined his regiment in India and then transferred from the 12th Royal Lancers to the
Bengal Staff Corps on 20 December 1886. He subsequently transferred to the
11th Bengal Lancers in 1887, seeing action on the
North-West Frontier in 1891. ; Captain N. J. C. Livingstone-Learmonth; Capt. O. A. G. Fitzgerald; Colonel W. R. Birdwood; Captain W. F. Basset; Lord Kitchener. He later became
adjutant of the
Viceroy's Bodyguard in 1893. He was promoted to
captain on 9 May 1896 and "served in the
Tirah campaign 1897–1898, at Chagru Kotal, Dargai, (18 October 1897); Saran Sar (9 November 1897); the Warran Valley (16 November 1897) and Dwatoi (24 November 1897). He was
mentioned in despatches for this campaign and went on leave to England in 1899". Birdwood served in the
Second Boer War, which began in October 1899, initially as a
brigade major with a mounted brigade in
Natal from 10 January 1900 and then as deputy assistant adjutant general on the staff of Major General
Lord Kitchener from 15 October 1900. Promoted to
brevet major on 20 November 1901 and local
lieutenant colonel in October 1901, he became military secretary to Lord Kitchener on 5 June 1902, and followed him on his return to the United Kingdom on board the SS
Orotava, which arrived in
Southampton on 12 July 1902. He received a brevet promotion to lieutenant colonel in the South African Honours list published on 26 June 1902. In a despatch from June 1902, Lord Kitchener wrote the following about his work in South Africa: :This young officer has held a difficult position as Assistant Adjutant-General, Mounted Troops, and responsible adviser as to the distribution of remounts. In carrying out these duties he has proved himself to possess exceptional ability, and he has shown, moreover, remarkable tact in dealing with and conciliating the various interests which he had to take into consideration. 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 while serving as a colonel on the staff on 28 June 1909. Promoted to the rank of
major general on 3 October 1911, Birdwood became
quartermaster-general in India and a member of the Viceroy's Legislative Council in 1912 and then Secretary of the Indian Army Department in 1913. ==First World War==