The 33rd Division was a New Army infantry division of the British Army formed in 1914 during the First World War as the 40th Division in the K5 Army group then renumbered in April 1915 as part of the new K4 Army Group.
A 33rd Division had been formed as part of the reserve K4 Army in October 1914 but was dissolved in April 1915 at which point the 40th division of the K5 Army became the 33rd of the K4.
The division landed in France in November 1915 and spent the duration of the Great War in action on the Western Front. The division's insignia was the "double-three" from a set of dominoes.
98th Brigade
The brigade originally comprised four battalions of the Royal Fusiliers.
18th (Service) Battalion, Royal Fusiliers (to 19th Brigade November 1915)
19th (Service) Battalion, Royal Fusiliers
20th (Service) Battalion, Royal Fusiliers (to 19th Brigade November 1915)
21st (Service) Battalion, Royal Fusiliers
From February 1916, the brigade comprised the following battalions:
4th (Extra Reserve) Battalion, King's (Liverpool Regiment)
1/4th Battalion, Suffolk Regiment (until February 1918)
1st Battalion, Middlesex Regiment (from 19th Brigade November 1915)
2nd Battalion, Argyll and Sutherland Highlanders (from 19th Brigade November 1915)
99th Brigade
The brigade transferred to the 2nd Division in November 1915, swapping with the 19th Brigade.
17th (Service) Battalion, Royal Fusiliers
22nd (Service) Battalion, Royal Fusiliers
23rd (Service) Battalion (Sportsman's Battalion), Royal Fusiliers
24th (Service) Battalion (Sportsman's Battalion), Royal Fusiliers
100th Brigade
16th (Service) Battalion (Public Schools), Middlesex Regiment (until February 1916)
16th (Service) Battalion (Church Lads' Brigade), King's Royal Rifle Corps
1st Battalion, Queen's (Royal West Surrey Regiment) (to 19th Brigade February 1918)
2nd Battalion, Worcestershire Regiment
1/9th Battalion (Glasgow Highlanders), Highland Light Infantry (from May 1916)
19th Brigade
The brigade joined from the 2nd Division in November 1915, swapping with the 99th Brigade.
18th (Service) Battalion, Royal Fusiliers (from 98th Brigade November 1915 until February 1916)
20th (Service) Battalion, Royal Fusiliers (from 98th Brigade November 1915 disbanded February 1918)
2nd Battalion, Royal Welsh Fusiliers (to 115th Brigade 38th Division February 1918)
1st Battalion, Cameronians (Scottish Rifles)
1/5th Battalion, Cameronians (Scottish Rifles) (merged with 1/6th Battalion in May 1916 becoming 5th/6th Battalion)
1st Battalion, Queen's (Royal West Surrey Regiment) (from 100th Brigade February 1918)
Battle of the Somme(1916)
Battle of Bazentin Ridge and
Attacks on High Wood
Battle of Arras
Third Battle of Ypres
Commanders
Major-General P. R. Wood
Major-General Herman Landon November 1915 – September 1916
Major-General Reginald John Pinney September 1916 – February 1919 (disbandment)
