173rd (3/1st London) Brigade

The 173rd (3/1st London) Brigade was a formation of the Territorial Force of the British Army. It was assigned to the 58th (2/1st London) Division and served on the Western Front during the First World War. The brigade was raised in April 1915, to replace the 2/1st London Brigade.

Formation
The infantry battalions did not all serve at once, but all were assigned to the brigade during the war.
 * 3/1st Battalion, London Regiment
 * 3/2nd Battalion, London Regiment
 * 3/3rd Battalion, London Regiment
 * 3/4th Battalion, London Regiment
 * 2/24th Battalion, London Regiment
 * 197th Machine Gun Company
 * 214th Machine Gun Company
 * 173rd Trench Mortar Battery