The 50th Brigade was an infantry brigade formation of the British Army. It was formed in World War I as part of the New Army, also known as Kitchener's Army. It was assigned to the 17th (Northern) Division and 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
50th Brigade (United Kingdom) Wikipedia(Text) CC BY-SA