The philosophy of the age, most fervently adopted by the French, was that willpower, spirit, morale, élan, and aggressiveness were the keys to success. For three years, generals flung highly motivated men at fortified machine-gun emplacements, only to see tens of thousands, then hundreds of thousands, shredded to mincemeat to gain a mile of useless ground. In 1917, around the village of Passchendaele in Flanders, British general Douglas Haig planned an assault. He wanted to break through the Germans’ fortified lines and open up a path to the sea, dividing the German army. He had been advised
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