堑壕战
The division headquarters opened in France on 31 January, at Château de Nieppe east of Saint-Omer. Part of XI Corps, on 5 February the division began to send officers and N.C.O.s to the front line to begin Trench warfare training and to move closer to the line in the Armentières sector. By mid February, in weather that was alternating rain and snow, infantry battalions and gunners from the 158th and 163rd Artillery Brigades were detached to front line divisions for further training, initially, the 17th Royal Scots and 17th West Yorks to 19th (Western) Division, and 17th and 18th Lancashire Fusiliers and 23rd Manchesters under the 38th (Welsh) Division. The first battlefield casualty of the division occurred on 20 February to a man of the 17th West Yorks.