UFPJ had hoped for up to a million people attending, and it was announced at the protest that aerial photography had estimated that at least 500,000 showed up. The Associated Press has stated that the march drew "tens of thousands".
Capitol police stopped the SDS feeder march near the corner of 3rd and Maryland. As the march turned north, police blocked protesters who walked onto the Capitol lawn. Other protesters, both from the march and on the Mall, moved up in support. The Capitol police moved back to the Capitol building. Some participants in this group left graffiti on the Capitol grounds.
In the late afternoon, approximately 30 demonstrators marched to the Armed Forces Recruiting Center at 14th street. The window at the recruitment center was smashed, and the demonstrators dispersed soon after.
A counter-protest organized by Free Republic, drawing around thirty people, was staged in the vicinity. Organizers of the counter-protest claimed that anti-war efforts hurt the United States' War on Terrorism.