 The 1/5th Battalion was mobilised in the 164th (North Lancashire) Brigade of the 55th (West Lancashire) Division; it landed in France in February 1915 and was temporarily attached to 28th Division and 1st Division; it returned to 166th (South Lancashire) Brigade in the 55th Division in January 1916.The 2/4th Battalion was formed September 1914 as a 2nd Line duplicate of 1/4th Battalion; it became the 4th (Reserve) Battalion and absorbed 5th (Reserve) Battalion 1916; it was stationed in Dublin from June 1918.The 2/5th Battalion was formed September 1914 as a 2nd Line duplicate of 1/5th Battalion; it was attached to the 164th (North Lancashire) Brigade of the 55th (West Lancashire) Division February 1915, then to 170th (2/1st North Lancashire) Brigade of 57th (2nd West Lancashire) Division; it landed in France February 1917.