Organized by the New Mobilization Committee to End the War in Vietnam ("New Mobe"), an estimated 500,000 demonstrators rallied in Washington as part of the largest such rally to date. It began with a march down Pennsylvania Avenue to the Washington Monument, where a mass rally and speeches were held. Pete Seeger, Arlo Guthrie, Peter, Paul, and Mary, and four different touring casts of the musical "Hair" entertained the demonstrators.
Later, violence erupted when police used tear gas on radicals who had split off from the main rally to march on the Justice Department. The crowd of about 6,000, led by members of the Youth International Party ("Yippies"), threw rocks and bottles and burned U.S. flags. Almost 100 demonstrators were arrested.
The largest protest outside Washington was held in San Francisco, where an estimated 250,000 people demonstrated. Antiwar demonstrations were also held in a number of major European cities, including Frankfurt, Stuttgart, West Berlin, and London. The largest overseas demonstration occurred in Paris, where 2,651 people were arrested.