Lines of grey muttering faces, masked with fear,
They leave their trenches, going over the top,
While time ticks blank and busy on their wrists,
And hope, with furtive eyes and grasping fists,
Flounders in mud. O Jesus, make it stop!
— Siegfried Sassoon.
Implausible as it might seem, it was the violent protest of a group of Bosnian high school students that sparked World War I.