and left June 1918) 7/8th (Service) Battalion Royal Inniskilling Fusiliers (joined June left July 1918) 102nd Machine Gun Company (joined 27 April 1916, moved to 34th Battalion M.G.C. 26 February 1918) 102nd Trench Mortar Battery (joined 18 February 1916, broken up 16 May 1918) After reorganisation in July 1918: 1/1st Battalion, Herefordshire Regiment (joined June 1918) 1/4th Battalion, Cheshire Regiment (joined July 1918) 1/7th Battalion, Cheshire Regiment (joined July 1918) 102nd Trench Mortar Battery (reformed 10 July 1918) 103rd (Tyneside Irish) Brigade 24th (Service) Battalion, (1st Tyneside Irish), Northumberland Fusiliers (merged with 27th Battalion to form 24/27th Battalion N.F. on 10 August 1917, disbanded February 1918) 25th (Service) Battalion, (2nd Tyneside Irish), Northumberland Fusiliers (left February 1918) 26th (Service) Battalion, (3rd Tyneside Irish), Northumberland Fusiliers (disbanded February 1918) 27th (Service) Battalion,(4th Tyneside Irish), Northumberland Fusiliers (merged with 27th Battalion to form 24/27th Battalion N.F. on 10 August 1917) 9th (Service) Battalion, the Northumberland Fusiliers (joined August 1917, left 26 May 1918) 1st Battalion, East Lancashire Regiment (joined February 1918 left May 1918) 10th (Service) Battalion (Grimsby Chums), Lincolnshire Regiment (transferred from 101st Brigade February 1918 left June 1918) 103rd Machine Gun Company (joined 27 April 1916, moved to 34th Battalion M.G.C. 26 February 1918) 103rd Trench Mortar Battery (joined 18 February 1916, broken up 16 May 1918) After reorganisation in July 1918: 1/5th (Dumfries and Galloway) (T.F.) Battalion, King's Own Scottish Borderers (joined June 1918) 1/8th Battalion, (T.F.) Cameronians (Scottish Rifles) (joined June 1918) 1/5th (Renfrewshire) (T.F.) Battalion, Argyll & Sutherland Highlanders (joined June 1918) 103rd Trench Mortar Battery (reformed 1 July 1918) On the First day on the Somme, the division had the largest number of casualties of the British divisions, the 102nd Brigade had and the 103rd Brigade incurred From the brigades were swapped with the 111th and 112th brigades of the 37th Division, which was holding the line on a quiet sector at Vimy Ridge. Divisional Troops 18th (Service) Battalion, the Northumberland Fusiliers (joined as Divisional Pioneer Battalion July 1915, left June 1918) 2/4th (T.F.) Battalion, the Somerset Light Infantry (joined as Divisional Pioneer Battalion June 1918) Thirteen other infantry battalions joined the Division for short periods during its reorganisation in mid 1918, all had left by July 1918) 19th Motor Machine Gun Battery (joined November 1915 left 6 February 1916) 240th Machine Gun Company (joined 18 July 1917, moved to 34th Battalion M.G.C. 26 February 1918)