[4] He then attended the Royal Military College, Sandhurst and was commissioned as a second lieutenant in the 2nd Battalion, Dorsetshire Regiment on 6 December 1899.

[4][5] The regiment was stationed in South Africa, so he was involved throughout the Second Boer War, part of the time he was an Aide de Camp to General Talbot Coke, and he also served as a staff officer to Colonel Williams, who commanded a Mounted Infantry Column.

[13] He served in Egypt from 1906 to 1908,[4] and from 27 June 1911 he was Aide de camp,[14] and from 12 August 1913 to 14 October 1914, Military Secretary to Lord Denman the Governor-General of Australia.

[9][15][16] With the outbreak of the First World War, Barttelot initially served in France with the 4th (Reserve) Battalion Coldstream Guards, from 12 August 1914, where he was wounded at the Battle of the Aisne and also awarded the French Croix de Guerre.

[4][17] He was then appointed a General Staff Officer, Grade III on 11 February 1915 and was concerned with coastal defence around Portland,[4][18] and served in the ill-fated Gallipoli campaign from July 1915,[4][19] where he was promoted major on 1 September 1915.

The wife in question, Mrs Maclaren, left Tehran a month ago and passed through here on her way to England.

He was a nice, pleasant, not particularly brilliant British landowner; we made rather friends, just because he was the sort of man I knew at home - at least that was my feeling about him.

The eldest son, Sir Walter de Stopham Barttelot, 4th Baronet, was killed in action as a brigadier on 16 August 1944, in Normandy during Operation Overlord during the Second World War.