Question: During the First World War, the 3rd Cavalry Brigade of the British Army served on the Western Front, but where did the German Army first attack them in that main theater of the war?
Sentence (from "3rd Cavalry Brigade (United Kingdom)"): It served in the Napoleonic Wars (notably at the Battle of Waterloo), in the Boer War, and in the First World War on the Western Front where it was initially assigned to The Cavalry Division before spending most of the war with the 2nd Cavalry Division.
Relevant evidence: No