33rd Division (United Kingdom)

The British 33rd Division was a New Army division formed in 1914 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 First World War in action on the Western Front.
The division's insignia was the "double-three" from a set of dominoes.
Unit history
Formation

98th Brigade 

The brigade originally comprised four battalions of the Royal Fusiliers.

18th (Service) Battalion, Royal Fusiliers (to 19 Bde November 1915)
19th (Service) Battalion, Royal Fusiliers
20th (Service) Battalion, Royal Fusiliers (to 19 Bde November 1915)
21st (Service) Battalion
...