Mr Junger's study, a platoon of airborne infantry, was deployed to the Korengal valley, a remote and craggy tract of north-eastern Afghanistan. Of negligible strategic importance, the Korengal gained notoriety in 2005 after 19 American commandos were killed there, in one of the single biggest human and military disasters for the Americans in the then four-year campaign. An army company was subsequently deployed to the narrow, six-mile-long valley, to restore American pride, many assumed. Yet the mission failed—for many of the same reasons now threatening America and its allies' overall effort in Afghanistan.

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