Sackville-West was educated at Winchester College, an independent school for boys in the English South Coast city of Winchester in Hampshire, followed by the Royal Military College, Sandhurst.
In 1919, he was British Military Representative on the Supreme War Council and from 1920 to 1924 he was military attaché in Paris. He served as Lieutenant Governor of Guernsey. West. East. Sackville-West and Georgina Dodwell.
In 1889, Sackville-West joined the King"s Royal Rifle Corps as a subaltern and participated in the 1891 expedition to Manipur and the 1892 expedition to Burma.
By the mid-1890s, Sackville-West was serving as a staff officer in a number of posts, eventually being attached to the staff of General Sir Redvers Buller during the Second Boer War. Following the war, Sackville-West was appointed Aide-de-camp to Lieutenant-General Sir Henry Hildyard, Commanding the 1st Army Corps.
In 1906, Sackville-West was attached to the Staff College, Camberley and in 1914 at the outbreak of the First World War, he was at the War Office. However, the need for experienced officers in the field prompted his movement to the Indian Army Corps on the Western Front until December 1915, when he was given command of the 21st Infantry Brigade.
On 30 July 1916, at the height of the Battle of the Somme, Sackville-West was wounded in an attack by a German bomber on his brigade headquarters.
Evacuated to Britain, he had recovered by October, when he took over the 190th Infantry Brigade. Within days of this posting however Sackville-West was wounded in the jaw when a high-explosive shell detonated in the midst of his command group as he inspected the trenches in front of Hamel. Although wounded, dazed and partially buried, Sackville-West was able to reach the casualty clearing station unaided, and was again evacuated to Britain to recover.
Returning to the Western Front for the third time in March 1917, Sackville-West commanded the 182nd Infantry Brigade until November when he was made a major general and attached to the General Staff.
Between 1920 and 1924 he was military attaché in Paris and from 1925 to his retirement in 1929 he served as Lieutenant Governor of Guernsey.