 Complete the following phrase:  Known as 87 Battery Royal Field Artillery, and based in Ireland, when the First World War broke out the battery were immediately mobilised along with the rest of 12th Howitzer Brigade Royal Field Artillery, under the 6th Division. It spent the war fighting in the relatively small battlefields of France and Belgium, in extremely poor conditions in the trenches of the First Battle of the Aisne, Somme, Ypres, Cambrai and the Hindenburg Line. During the 