The Division came into existence of Army Order No.324, issued on 21st August 1914, authorising the formation of the six new Divisions of K1. It was formed of volunteers, under the care of the War Office. Initially without equipment or arms of any kind, the recruits were judged to be ready by late Spring 1915, and it was ordered to reinforce the beleagured garrison on Gallipoli.

1 July 1915 : sailed from Liverpool, landing Alexandria, and on to Mudros, completing concentration by 28 July 1915

7 August 1915 : landed at Suvla Bay, Gallipoli

21 December 1915 : withdrew from Gallipoli, to Egypt

July 1916 : landed at Marseilles, spent remainder of the war on the Western Front

On 28 June 1919, the Division ceased to exist, having lost more than 32,100 casualties during the war. 

• 32nd Brigade

  • 9th (Service) Bn, the West Yorkshires (joined August 1914)

  • 6th (Service) Bn, the East Yorkshires (joined August 1914, left December 1914)

  • 2nd Bn, the Yorkshire (joined May 1918)

  • 6th (Service) Bn, the Yorkshire (joined August 1914, left June 1918)

  • 6th (Service) Bn, the York and Lancaster (joined August 1914)

  • 32nd Brigade Machine Gun Company (formed March 1916, moved into 11 MG Bn 28 February 1918)

  • 32nd Trench Mortar Battery (joined 17 July 1916)

• 33rd Brigade

  • 6th (Service) Bn, the Lincolns (joined August 1914)

  • 6th (Service) Bn, the Border (joined August 1914, disbanded February 1918)

  • 7th (Service) Bn, the South Staffordshire (joined August 1914)

  • 9th (Service) Bn, the Sherwood Foresters (joined August 1914)

  • 33rd Brigade Machine Gun Company (formed March 1916, moved into 11 MG Bn 28 February 1918)

  • 33rd Trench Mortar Battery (joined July 1917)

• 34th Brigade

  • 8th (Service) Bn , the Northumberland Fusiliers (joined August 1914)

  • 9th (Service) Bn , the Lancashire Fusiliers (joined August 1914, disbanded February 1918)

  • 8th (Service) Bn, the Duke of Wellington's (joined August 1914, disbanded February 1918)

  • 5th (Service) Bn, the Dorsets (joined August 1914)

  • 11th (Service) Bn, the Manchesters (joined August 1914)

  • 34th Brigade Machine Gun Company (formed March 1916, moved into 11 MG Bn 28 February 1918)

  • 34th Trench Mortar Battery (joined July 1917)

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• Divisional Troops

  • 6th (Service) Bn, the East Yorkshires (joined December 1914)

  • 250th Machine Gun Company (joined 16 November 1917, joined Divisional MG Battalion 28 February 1918)

  • No 11 Machine Gun Battalion (created 28 February 1918)

  • No 11 Motor Machine Gun Battery (joined early 1915, left when Division moved to Gallipoli)

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• Divisional Mounted Troops

  • A Squadron, Royal Glasgow Yeomanry (joined 2 June 1915, left 30 June 1915)

  • B Squadron, 1st Hertfordshire Yeomanry (joined 4 April 1916, left July 1916)

  • 11th Divisional Cyclist Company (formed January 1915, left 12 July 1916)

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• Divisional Artillery

  • LVIII Brigade, RFA

  • LIX Brigade, RFA

  • LX Brigade, RFA (disbanded 5-13/2/1918)

  • LXI (H) Brigade, RFA (left Division on embarkation for Gallipoli)

  • CXXXII Brigade, RFA (joined 26/4/1916 in Egypt as a Howitzer Brigade, broken up 25/1/1917)

  • 11th (Hull) Heavy Battery, RGA (a Battery of 4 4.7-inch guns which left the Division before embarkation for Gallipoli and joined XXXVIII Heavy Artillery Brigade.)

  • 11th Divisional Ammunition Column

  • V.11 Heavy Trench Mortar Battery RFA (joined 9 August 1916, left 12 February 1918)

  • X.11, Y.11 and Z.11 Medium Mortar Batteries RFA (joined 9 August 1916; on 3 February 1918, Z broken up and batteries reorganised to have 6 x 6-inch weapons each)

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• Engineer Units

  • 67th Field Company (joined Oct 1914)

  • 68th Field Company (joined Oct 1914)

  • 86th Field Company (joined February 1915)

  • 11th Divisional Signal Company (joined Oct 1914)

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• Field Ambulances

  • 33rd Field Ambulance (joined Oct 1914)

  • 34th Field Ambulance (joined Oct 1914)

  • 35th Field Ambulance (joined Oct 1914)

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11th Divisional Train ASC (112, 113, 114 and 115 Coys). This train did not sail for Gallipoli. It joined 26th Division 1 April 1916, and was replaced by the Companies of the 53rd Divisional Train.

213th Divisional Employment Company (joined by 30 June 1917)

22nd Mobile Veterinary Section

21st Sanitary Section ( left 9/12/1916, for IV Corps Sanitary Area, Fifth Army)

11th Divisional Motor Ambulance Workshop (absorbed by Divisional Train when Division moved to Gallipoli)