The decapitated bodies of the soldiers lined a major boulevard, accompanied by a sign: “For every one of mine that you kill, I will kill 10.” A bag of their heads, some still gagged with tape, was found nearby. The discovery in Chilpancingo, an hour north of the resort of Acapulco in southern Mexico, marked the most gruesome attack yet against the Mexican army in its half-century battle against drug gangs. Full Story