The journey from 9/11 to the Boston Marathon bombings includes a secret history of the battle against terrorism. At the Pentagon, by 2002, Donald Rumsfeld was waging a covert campaign inside the Defense Department. “Rumsfeld was something of an empire builder─ you know, to create as much power in his department as possible.” said Richard Immerman, professor of history and director of the Center for the Study of Force and Diplomacy at Temple.