Pentagon firefighters Alan Wallace and Mark Skipper had just learned the shocking news that planes had struck the World Trade Center when they saw something equally inconceivable: a twin-engine jetliner flying straight at them. It was American Airlines Flight 77, rushing toward its target. In his Pentagon office, Army major David King was planning a precautionary evacuation when the room suddenly erupted in flames. Arlington firefighters Derek Spector, Brian Roache, and Ron Christman, among the first responders at the scene, were stunned by the sight that met them: a huge flaming hole gouged into the Pentagon's side, a lawn strewn with smoking debris, and thousands of people, some badly injured, stumbling away from what would become one of the most daunting fires in American history.

For more than twenty-four hours, Arlington firefighters and other crews faced some of the most dangerous and unusual circumstances imaginable. The size and structure of the Pentagon itself presented unique challenges, compelling firefighters to devise ingenious tactics and make bold decisions -- until they finally extinguished the fire that would threaten to cripple America's military infrastructure just when it was needed most.