Born in
Guernsey and educated in
Jersey, De Lisle was, after graduating from the
Royal Military College at Sandhurst,
commissioned into the 2nd Battalion of the
Durham Light Infantry (DLI) in March 1883. He saw service with the
mounted infantry in Egypt between 1885 and 1886, In December 1885, a day after the
Battle of Ginnis against the
Mahdist State, he led a patrol which attacked a nuggar barge on which a widow of a Mahdist Sheik was trying to escape the area with her son. The mother and her year old son were separated and the troops found the child alone near a river barge on the Nile. The regiment adopted the boy, christening him
James Francis Durham, after two soldiers and the regiment itself. Jimmy Durham was raised within the battalion and went on to become first soldier of African descent in the British Army. De Lisle was promoted to the rank of
lieutenant in March 1887 and
captain on 1 October 1891. De Lisle studied at the
Staff College, Camberley in 1899. After the outbreak of the
Second Boer War in late 1899, he was appointed in command of the Australian Brigade, with the local rank of
lieutenant colonel from 30 January 1900. The brigade was a mobile column comprising the 6th Battalion, Mounted Infantry, the
West Australian Mounted Infantry, the South Australian Imperial Bushmen and the New South Wales Mounted Rifles. Most of these units followed him when in April 1900 he was appointed in command of the 2nd Corps of Mounted Infantry, part of the 1st Mounted Infantry Brigade under overall command by Major General
Edward Hutton. This force was actively engaged both during
Lord Roberts's advance from
Bloemfontein and after the fall of Pretoria, and he took part in the
Battle of Diamond Hill (June 1900). He was severely wounded and three times
mentioned in dispatches. Promotion to
major came on 1 January 1902, and to the
brevet rank of lieutenant colonel on the following day. During the early months of 1902 his brigade was stationed in
Natal, but in April he left the command of this brigade and transferred to
Transvaal where there was more intense fighting. He left
Cape Town for the United Kingdom in late May 1902. In a despatch dated 23 June 1902,
Lord Kitchener, who had been
commander-in-chief (C-in-C) during the latter part of the war, described De Lisle as "an officer of remarkable force of character. He has soldierly qualities and is a fine leader." For his service he was appointed a
Companion of the Order of the Bath (CB) on 21 August 1902, and received the actual decoration from
King Edward VII at
Buckingham Palace on 24 October 1902. After his return he formally transferred to the cavalry when he was commissioned as a major in the
5th (Princess Charlotte of Wales's) Dragoon Guards on 22 October 1902. Later the same year he was appointed in command of the 2nd Provisional Regiment of Hussars at
Hounslow. De Lisle was appointed
second-in-command of the
1st (Royal) Dragoons in 1903 and then became
commanding officer (CO) of the regiment in 1906, He was promoted to brevet colonel in August. After serving on
half-pay from February 1910, he was promoted to colonel, and succeeded Colonel
Alexander Godley as
general staff officer, grade 1 (GSO1) of the
2nd Division at
Aldershot from March 1910. Upon relinquishing this assignment, in August 1911 he was promoted to the temporary rank of
brigadier general and was appointed commander of the
2nd Cavalry Brigade. ==First World War==