Not since the 1970s has there been such an important discovery from the Great War in France. In woods on a ridge not far from the city of Reims, the bodies of more than 270 German soldiers have lain for more than a century - after they died the most agonising deaths imaginable.On 4 May 1917 the French launched an artillery bombardment targeting the two ends of the tunnel, sending up an observation balloon to get a sight on the north-facing slope. For once their accuracy was formidable. A shell fired from a naval gun hit the entrance, triggering more...