The two commanders of the British Expeditionary Force during the First World War, Field Marshals John French and Douglas Haig, came from the 19th (Queen Alexandra's Own Royal) Hussars and 7th (Queen's Own) Hussars respectively.
[3][4] William Robertson, 3rd (Prince of Wales's) Dragoon Guards, who rose in rank from private to field marshal,[5] was the Quartermaster General, then Chief of Staff of the British Expeditionary Force,[6][7] before becoming the Chief of the Imperial General Staff in December 1915.
[9] He was replaced by William Birdwood, 12th (Prince of Wales's) Royal Lancers, who had previously commanded the Australian and New Zealand Army Corps during the Gallipoli Campaign.
[11] Charles Briggs, 1st (King's) Dragoon Guards, commanded the British Salonika Army.
William Peyton, 15th (The King's) Hussars, commanded the Western Desert Force during the Senussi Campaign.