Dan Snow looks at the Battle of Amiens - the beginning of the end of the First World War, and the symbolic start of modern warfare
In August 1918 after years of disappointment, bloodshed and stalemate, Allied troops launched a surprise overwhelming attack on the German Army - a short, four day battle in which the Allied forces advanced 12 miles, more than the total advance of the Somme and Passchendaele offensives combined. Veterans recall how they did it.
Presented by Dan Snow
Produced by Megan Jones for BBC Wales