Afghanistan is the largest and the most difficult crisis Obama confronts away from home. And here the trap was fashioned largely by himself. He said, all through the presidential campaign, that Iraq was the wrong war but Afghanistan was the right one. It was ‘a war of necessity’, he said this summer. And he has implied that he would accept his generals’ definition of the proper scale of such a war. Now it appears that Afghanistan is being lost, indeed that it cannot be controlled with fewer than half a million troops on the ground for a decade or more. The generals are for adding troops, as in Vietnam, in increments of tens of thousands. Their current request was leaked to Bob Woodward, who published it in the Washington Post on 21 September, after Obama asked that it be kept from the public for a longer interval while he deliberated. The leak was an act of military politics if not insubordination; its aim was to show the president the cost of resisting the generals.