"The United States is at war with a foe that is, as the cliche has it, "a shadowy terrorist network," a multinational private army whose nodes and lines of communication reach invisibly and murderously across national borders. It's centipedal, multiheaded, hard to find, difficult to kill. Don't be fooled by familiar-seeming before-and-after images of bomb damage or shots of jet fighters streaking off the decks of aircraft carriers: This is a new kind of war -- netwar."