The 109th Brigade was a formation of the British Army during the First World War. It was raised as part of the new army also known as Kitchener's Army and assigned to the 36th (Ulster) Division. The brigade served on the Western Front.
Formation
The infantry battalions did not all serve at once, but all were assigned to the brigade during the war.
References
109th Brigade (United Kingdom) Wikipedia(Text) CC BY-SA