Trench warfare in World War I was absolutely brutal. The Western Front of the war in 1914 included trenches where French and English soldiers awaited the next attack from the Germans (or vice versa), or simply wallowed in the frost and mud, biding their time. They were within less than the length of a football field in some places—as close as sixty to eighty yards—from the enemy. So close that the soldiers could sometimes hear each other talk, or cough. Or even sing.