The 173rd (3/1stLondon) Brigade was a formation of the British Army's Territorial Force that was raised in 1915. It was assigned to the 58th (2/1st London)
the 173rd (3/1stLondon) Brigade, training in the UK, were renumbered as the 'New' 2/1st, 2/2nd etc Bns. The brigade had already taken 2/1stLondon Bde's
10 September 58thDivision attacked the villages round Épehy which formed the outposts of that line. 173rd Brigade led, with 2/2nd Londons attacking Pezières
the place of the 2/1stLondon Bde in 58th (2/1stLondon) Division and was numbered as 173rd (3/1stLondon) Bde. 58th (2/1st L) Division's training was still