"Afghanistan was the so-called Graveyard of Empires, a pitiless mass of hard mountains and desert almost the size of Texas that had successfully repelled invaders like the Brits and the Soviets and seemed amenable only to the unforgiving people born to it. Men learned to fight like they learned to breathe, without even thinking. They fought dogs, they fought cocks. They fought tiny delicate birds that fit in a human hand and lived in a human coat pocket, and they bet on the results. They fought wars for decades until no one seemed to remember quite what they were fighting for. The national sport was essentially a fight, on horseback, over a headless calf or goat. Over the years, whenever Afghan men would tell me that they were tired of fighting, looking weary and creased, I would have only one response: Sure you are."