French casualties in WWI

World War I cost France 1,357,800 dead, 4,266,000 wounded (of whom 1.5 million were permanently maimed) and 537,000 made prisoner or missing — exactly 73% of the 8,410,000 men mobilized, according to William Shirer in The Collapse of the Third Republic. Some context: France had 40 million citizens at the start of the war; six in ten men between the ages of eighteen and twenty-eight died or were permanently maimed.