France 1346: The army of King Philip VI is Europe's pre-eminent killing machine. It's accustomed to crushing any force stupid enough to oppose it, and now fully expects to annihilate a motley band of English invaders in a field near the village of Crecy.   

Except as night falls, it is Philip's army that lies broken and bleeding in the mud. What went wrong? The French knights, it seems, had failed to update their corporate culture.   

For a full list of sources go to timharford.com