At 9.30am on 21 March 1918, the last great battle of the First World War commenced when three German armies struck a massive blow against the weak divisions of the British Third and Fifth Armies. It was the first day of what the Germans called the Kaiserschlacht (‘the Kaiser’s Battle’), the series of attacks that were intended to break the deadlock on the Western Front, knock the British Army out of the war, and finally bring victory to Germany.