The World Remade by G.J. Meyer:
"France had suffered as much as any country and more than most, the [First World] war having taken nearly 3.5% of her population, one of every four men between the ages of eighteen and thirty. But a dozen other nations were similarly bereaved. From Portugal to the Russian steppe, men were learning to live without a limb or all their limbs. And learning to live with the compulsive twitching and trembling that were among the mysterious symptoms of shell shock, a new kind of affliction the name of which reflected ignorance of its cause."