August 1914 : Formed in Ireland as part of K1. Moved in 1915 to the Curragh, Newbridge and Kildare, where training in Brigade strength began.

May 1915 : moved to England and concentrated around Basingstoke. Was inspected by Lord Kitchener at Hackwood Park on 28/29 May 1915.

On 27 June, the Division received orders to perpare for service on Gallipoli. Divisional HQ embarked at Liverpool on 9 July, and by the end of the month most units had assembled on Lemnos.

6-7 August 1915 : landed on Gallipoli at Suvla Bay, less 29th Brigade, which went to ANZAC Cove. The main body made an attack on Chocolate Hill 7/8 August. Parts of 29th Brigade took part in actions on Sari Bair 6-10 August, and Hill 60 later that month.

29 September 1915 : moved to Mudros, and on 4-5 October to Salonika, landing there 5-10 October. Took part on 7 and 8 December 1915 in the action at Kosturino, in the retreat from Serbia. Brigades of the Division were in action at the Karajakois (30 september to 2 October 1915) and Yenikoi (3-4 October 1915).

On 18 August 1917, the Division was ordered to concentrate at Salonika for embarakation. Early September 1917 : moved to Egypt, completeing assembly near Rafa by 16 October 1917. The Division was involved in the Palestine campaign thereafter. between April and June 1918, a major reorganisation took place as many British units were replaced by Indian ones.

On 12 November 1918, the Division concentrated at Sarafand, ready for moving back to Egypt. By 1 December it was at Cairo.

From 1914 to 1918, the Division suffered a total of 9,363 of all ranks killed, wounded or missing in action.

29th Brigade

5th (Service) Bn, the Royal Irish (joined August 1914, left June 1915 to become the Divisional Pioneer battalion)

6th (Service) Bn, the Royal Irish Rifles (joined August 1914, disbanded 15 May 1918)

5th (Service) Bn, the Connaught Rangers (joined August 1914, left 29 April 1918)

6th (Service) Bn, the Leinster (joined August 1914, left 2 May 1918)

10th (Service) Bn, the Hampshire (initially attached to Brigade as Army Troops March 1915, joined properly to replace 5th Royal Irish Rifles in June 1915, left November 1916)

1st Bn, the Leinster (joined November 1916)

29th Machine Gun Company (formed 10 May 1916, merged into the Divisional MG Battalion 7 May 1918)

29th Trench Mortar Battery (formed as No 7 Stokes Mortar Battery 2 October 1916, retitled 8 December 1916. Merged into Divisional TMB 17 October 1917)

1/54th Sikhs (joined 27 April 1918 from 1st (Peshawar) Division)

1/101st Grenadiers (joined 30 April 1918)

2/151st Infantry (joined 10 June 1918)

30th Brigade

6th (Service) Bn, the Royal Munster Fusiliers (joined August 1914, left 30 April 1918)

7th (Service) Bn, the Royal Munster Fusiliers (joined August 1914, absorbed by 6th Bn 3 November 1916)

6th (Service) Bn, the Royal Dublin Fusiliers (joined August 1914, left 27 May 1918)

7th (Service) Bn, the Royal Dublin Fusiliers (joined August 1914, left 30 April 1918)

1st Bn, the Royal Irish (joined 3 November 1916)

30th Machine Gun Company (formed 10 May 1916, merged into the Divisional MG Battalion 7 May 1918)

30th Trench Mortar Battery (formed as No 8 Stokes Mortar Battery 28 September 1916, retitled 8 December 1916. Merged into Divisional TMB 17 October 1917)

38th Dogras (joined 29 April 1918)

46th Punjabis (joined 25 May 1918)

1st Kashmir Rifles (joined 30 April 1918)

31st Brigade

5th (Service) Bn, the Royal Inniskilling Fusiliers (joined August 1914, left 28 May 1918)

6th (Service) Bn, the Royal Inniskilling Fusiliers (joined August 1914, left 2 May 1918)

5th (Service) Bn, the Royal Irish Fusiliers (joined August 1914, left 30 April 1918)

6th (Service) Bn, the Royal Irish Fusiliers (joined August 1914, absorbed by 5th Bn 2 November 1916)

2nd Bn, the Royal Irish Fusiliers (joined 2 November 1916)

38th (Service) Bn, the Royal Fusiliers (joined 11 June 1918, left 17 July 1918)

31st Machine Gun Company (formed 11 May 1916, merged into the Divisional MG Battalion 7 May 1918)

31st Trench Mortar Battery (formed 17 October 1916. Merged into Divisional TMB 17 October 1917)

2/42nd Deoli (joined 18 July 1918)

74th Punjabis (joined 29 April 1918)

2/101st Grenadiers (joined 1 May 1918)

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Divisional Artillery

LIV Brigade, RFA (joined September 1914, left for 28th Division 29 August 1917)

LV Brigade, RFA (joined September 1914, left for 13th Division January 1916)

LVI Brigade, RFA (joined September 1914, left for 13th Division January 1916)

LXVII Brigade, RFA (joined from 13th Division October 1915)

LXVIII Brigade, RFA (joined from 13th Division October 1915)

LVII (H) Brigade, RFA (joined September 1914, left for XII Corps Artillery 28 August 1917)

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

LVII Brigade, RFA (from 11th Division, came under orders of this Division between 16 August and 18 December 1915)

10th Heavy Battery, RGA (a Battery of 4 60-pounder guns)(joined in March 1915, came under orders of 11th Division by 10 August 1915)

15th Heavy Battery, RGA (a Battery of 4 60-pounder guns)(joined on Gallipoli on10 August 1915, left by 19 December 1915)

IV (Highland) Mountain Brigade (the Argyllshire and Ross & Cromarty Mountain Batteries) (joined on Gallipoli, 13 August 1915)

2nd Mountain Battery (joined in Salonika 30 December 1915, left for 27th Division 7 February 1916)

Hong Kong and Singapore Mountain Battery (joined in Salonika 1 September 1918, left 26 October 1918)

10th Divisional Ammunition Column (the original column did not go overseas with the Division. The Column formerly with 29th Division joined in Egypt in October 1915. Suffered losses when transport "Marquette" torpedoed off Salonika on 23 October. Numbers were made up by men, horses and equipment from 42nd Division Ammunition Column. Formally renumbered 10th DAC on 4 March 1916.)

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Divisional Mounted Troops

10th Divisional Cyclist Company (joined August 1914, left 7 December 1916, to XVI Corps)

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Divisional Troops

5th (Service) Bn, the Royal Irish (joined June 1915, left April 1918) Pioneer Battalion

Divisional Trench Mortar Battery (formed from Brigade TMBs on 17 October 1917. Broken up 9 June 1918)

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Engineer Units

65th Field Company (joined August 1914, left 14 July 1918)

66th Field Company (joined August 1914)

85th Field Company (joined January 1915)

18th Company, 3rd Sappers & Miners (joined by 17 July 1918)

10th Divisional Signal Company (joined August 1914)

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Field Ambulances

The three Field Amublances shown below were formed for the Division in August 1914. When the Division was indianised, they handed over all stores and equipment to the 154th, 166th and 165th Camel Field Ambulances and left on 20 May 1918, going to base.

30th Field Ambulance

31st Field Ambulance

32nd Field Ambulance

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Other Divisional Troops

10th Divisional Train ASC (108, 109, 110 and 111 Coys. This Train was replaced by the 52nd Divisional Train 471, 472, 473 and 474 Companies ASC in October 1915.)

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Other Divisional Troops

10th Divisional Train ASC (The original train consisted of 108, 109, 110 and 110 Companies. This train did not move overseas with this Division, and transferred to 22nd Division. It was replaced on 22 October 1915 in Salonika by the train from 52nd (Lowland) Division, consisting of 475, 476, 477 and 478 Companies).

25th Mobile Veterinary Section

No 21 Sanitary Section (joined August 1914, left 31 July 1915)

No 21 Sanitary Section (joined October 1915 from 52nd (Lowland) Division, rejoined that formation on 22 October 1917)

No 18 Sanitary Section (joined October 1917 from 52nd (Lowland) Division)

10th Divisional Motor Ambulance Workshop (joined August 1914. Remained with the orginal Divisional Train)

Some other units were under the command of the Division while it was in training in England. None of them proceeded overseas with the Division: 1 Squadron, South Irish Horse; 133 Fortress Company RE, 13th Battery of the Motor Machine Gun Service.