This battle honour was awarded for participation in the 1915 and 1917 campaigns conducted in the Ypres Salient. It covers specific actions between 22 April 1915 to 25 May 1915 and 31 July 1917 to 10 November 1917.
During the timeframes represented by this campaign battle honour the 15th Bn was additionally awarded the battle honours Gravenstafel, St. Julien and Passchendaele, all three of which are emblazoned on the Regimental Colour.