The Northumberland Brigade was formed in 1908 as part of the Territorial Force of the British Army with four battalions of the Northumberland Fusiliers. The brigade was numbered as 149th (Northumberland) Brigade in 1915 and served with the 50th (Northumbrian) Division on the Western Front throughout World War I. Due to losses suffered in the Ludendorf Offensive in 1918, it had to be comprehensively reorganized. Reformed as the Northumberland Brigade post-war, it was broken up before the outbreak of World War II.