completed the next day. Fighting in the southern sector (the BattleofArras) continued into May. 173rd Siege Bty switched to 79th HAG on 16 April and 15th HAG
Sacrifice: The BattleofArras1917. Barnsley: Pen and Sword Books. ISBN 1-84415-326-6. Passingham, I. (1998). Pillars of Fire: The Battleof Messines Ridge
Ransart, south ofArras. This was considered a quiet sector, and the battalions of173rd Bde were introduced to trench warfare by units of the 49th (West
History of the Great War: Military Operations, France and Belgium 1917, Vol I, The German Retreat to the Hindenburg Line and the BattleofArras, London: