Established by the Scottish Command, September 1914, as part of K2. Early days were somewhat chaotic, the new volunteers having very few trained officers and NCOs to command them, no organised billets or equipment. The Division was inspected by HM King George V on 26th September 1914 - it was the first occasion on which the Division paraded as a formed unit, and with the exception of the Staff, plain clothes were worn. By 22nd January 1915, the Division was in uniform for an inspection by Kitchener. BY the early Summer of 1915, the Division was considered to be ready for France, and embarkation orders were recived on 3rd July 1915.

7-13th July 1915 : landed in France; the Division served with distinction on the Western Front for the remainder of the war, taking part in most of the significant actions, and winning regard by the enemy as one of the most formidable in the British Army.

The Battle of Loos

In Spring 1916, the Division was involved in German gas attacks near Hulluch (27-29 April 1916), and in the defence of the Kink position (11 May 1916).

The Battle of Pozieres (third phase of the Battle of the Somme 1916)

The Battle of Flers-Courcelette (sixth phase of the Battle of the Somme 1916)

In the above action, the Division captured Martinpuich.

The Battle of Le Transloy (eighth) phase of the Battle of the Somme 1916)

The above action included Attacks on the Butte de Warlencourt.

The First Battle of the Scarpe (first phase of the Arras Offensive)

The Second Battle of the Scarpe (second phase of the Arras Offensive)

In the above action, the Division captured Guemappe.

The Battle of Pilckem (first phase of Third Battle of Ypres)

The Battle of Langemarck (second phase of Third Battle of Ypres)

The First Battle of Bapaume (second phase of the First Battles of the Somme 1918)

The First Battle of Arras, 1918 (fourth phase of the First Battles of the Somme 1918)

The Battle of the Soissonnais and of the Ourcq

In the above action, the Division took part in the Attack on Buzancy

The Final Advance in Artois

44th Brigade

1/4th Bn, the Black Watch (joined November 1915, left January 1916)

4/5th Bn, the Black Watch (joined June 1918)

9th (Service) Bn, the Black Watch (joined September 1914, left February 1918)

8th (Service) Bn, the Seaforth Highlanders (joined September 1914)

1/5th (Buchan and Formartin) Bn, the Gordon Highlanders (joined June 1918)

8th (Service) Bn, the Gordon Highlanders (joined May 1916, left as a cadre June 1918. Named 8/10th Bn from May 1916.)

9th (Service) Bn, the Gordon Highlanders (joined September 1914, left January 1915)

10th (Service) Bn, the Gordon Highlanders (joined September 1914, left May 1916)

7th (Service) Bn, the Cameron Highlanders (joined January 1915, left as a cadre June 1918)

44th Brigade Machine Gun Company (joined 12 February 1916, moved into 15 MG Bn 17 March 1918)

44th Trench Mortar Battery (joined 25 June 1916)

45th Brigade

13th (Service) Bn, the Royal Scots (joined September 1914)

6/7th (Service) Bn, the Royal Scots Fusiliers (joined as 7th Bn September 1914, became 6/7th May 1916, left February 1918)

6th (Service) Bn, the Cameron Highlanders (joined September 1914)

1/8th (The Argyllshire) Bn, the Argyll & Sutherland Highlanders (joined June 1918)

11th (Service) Bn, the Argyll & Sutherland Highlanders (joined September 1914, left as a cadre June 1918)

45th Brigade Machine Gun Company (joined 12 February 1916, moved into 15 MG Bn 17 March 1918)

45th Trench Mortar Battery (joined 17 June 1916)

46th Brigade

1/9th (Highlanders) Bn, the Royal Scots (joined June 1918)

1/4th Bn, the Suffolks (joined November 1915, left February 1916)

7th (Service) Bn, the King's Own Scottish Borderers (joined September 1914, became 7/8th May 1916)

8th (Service) Bn, the King's Own Scottish Borderers (joined September 1914, became 7/8th May 1916)

10th (Service) Bn, the Cameronians (Scottish Rifles) (joined September 1914)

4/5th Bn, the Black Watch (joined May 1918, left June 1918)

9th (Service) Bn, the Black Watch (joined February 1918, left as a cadre May 1918)

10/11th (Service) Bn, the Highland Light Infantry (joined May 1916, left February 1918)

12th (Service) Bn, the Highland Light Infantry (joined September 1914, left February 1918)

1/4th (Ross Highland) Bn, the Seaforth Highlanders (joined November 1915, left January 1916)

46th Brigade Machine Gun Company (joined 11 February 1916, moved into 15 MG Bn 17 March 1918)

46th Trench Mortar Battery (joined 20 June 1916)

Divisional Troops

7th (Service) Bn, the Bedfords (joined September 1914, left February 1915)

7th (Service) Bn, the Leicesters (joined September 1914, left April 1915)

9th (Service) Bn (Pioneers), the Gordon Highlanders (joined January 1915)

225th Machine Gun Company (joined 19 July 1917, moved into 15 MGBn 17 March 1918)

No 15 Machine Gun Battalion (created 17 March 1918)

No 11 Motor Machine Gun Battery (joined 23 June 1915, left 22 July 1916 when transferred to I Corps)

Divisional Mounted Troops

B Squadron , the Westmoreland and Cumberland Yeomanry (joined 23 June 1915, left 10 May 1916)

15th Divisional Cyclist Company (formed 23 December 1914, left 21 June 1916)

Divisional Artillery

LXX Brigade, RFA

LXXI Brigade, RFA

LXXII Brigade, RFA (left 20 January 1917)

LXXIII (H) Brigade, RFA (broken up 1-3 December 1916)

15th Heavy Battery, RGA (a Battery of 4 60-lbr guns raised with the Division but moved independently to Gallipoli and was attached to 10th (Irish) Division in 1915)

15th Divisional Ammunition Column

V.15 Heavy Trench Mortar Battery RFA (joined in November 1916, left 9 February 1918)

X.15, Y.15 and Z.15 Medium Mortar Batteries RFA (joined by June 1916; on 9 February 1918, Z broken up and batteries reorganised to have 6 x 6-inch weapons each)

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Engineer Units

73rd Field Company (joined Aug 1914)

74th Field Company (joined Aug 1914)

91st Field Company (joined Jan 15)

15th Divisional Signal Company (joined Sep 1914)

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Field Ambulances

45th Field Ambulance (joined Jun 1915)

46th Field Ambulance (joined Jun 1915)

47th Field Ambulance (joined Jun 1915)

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15th Divisional Train ASC (138, 139, 140 and 141 Coys ASC)

216th Divisional Employment Company (joined 22 May 1917)

27th Mobile Veterinary Section

32nd Sanitary Section ( left 29 March 1917, for XIX Corps)

15th Divisional Motor Ambulance Workshop (on 9 April 1916, absorbed by Divisional Train)