100th Brigade (United Kingdom)

100th Brigade
Active	1914–1918, 1945–1946
Allegiance	United Kingdom
Branch	Infantry
Part of	33rd Division (United Kingdom)
Engagements	Western Front, War in Vietnam (1945–46)

The 100th Brigade was a formation of the British Army founded during World War I. It was raised as part of the new army also known as Kitchener's Army and assigned to the 33rd Division. The brigade served on the Western Front. The brigade saw additional action during Britain's involvement in Vietnam following the Second World War.

The 100th Brigade, arrived at Saleux, France on 9 July 1916, arrived at Morlancourt on 11 July, Becordel-Becourt on 12 July, and Flatiron Copse on 14 July. It began an attack on High Wood, a small but highly-contested forested area in the Somme, on 15 July during the Allied withdrawal, withdrew itself to Mametz Wood on 16 July, and returned to Becordel-Becourt on 22 July. The brigade camped between Albert and Dernancourt on 23 July, and went to reinforce the 6th Seaforth battalion who were entrenched near High Wood. The 2nd Battalion then advanced with a new trench on 9 August and was replaced by the 16th Battalion of the King's Royal Rifle Corps, which was also part of the 100th Brigade. The 2nd Battalion then traveled to Mametz Wood on 10 August, Becordel-Becourt on 13 August, and Delville Wood on 19 August. On 24 August, the 100th Brigade attacked Tea Trench near High Wood but failed to take the position. The brigade was then relieved, traveled to Ribemont on 30 August, to Molliens-au-Bois on 31 August, to the north of Gommecourt on 19 September, and to Corbie on 19 October. It then relieved the 2nd Worcestershire Regiment at Frosty Trench on 2 November, and successfully took Hazy Trench on 5 November. It then traveled to Carnoy on 6 November, Citadel Camp on 7 November, and Airaines on 10 November.

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