October 1967 March on the Pentagon On October 21, 1967, an estimated 100,000 Vietnam War protesters rallied in Washington, DC. More than 35,000 demonstrators marched to the Pentagon in Arlington, Virginia, and many remained there overnight. More than 600 protesters, including author Norman Mailer, were arrested. The Vietnam Peace Commemoration Committee hosted a panel discussion on the March on the Pentagon. Many speakers were activists who participated in the Washington, D.C., protest.