karzai londonAt last week's London conference, two of the great truisms of warfare punched their way to the surface. The first is that wars are fought as much on the home front as on the battlefield. With public support for the war in Afghanistan ebbing away, the United States and its allies in NATO have shifted from seeking outright victory to looking for an exit strategy that will allow them to start bringing home their troops next year.  Rather as the British did after their two failed invasions of Afghanistan in the 19th century, they are sending in reinforcements in a display of military might which they hope will secure better terms in an eventual settlement.