The march, on a cold, cloudy and windy St. Patrick's Day, comes just before the fourth anniversary of the start of the Iraq war on Tuesday and 40 years after a similar protest at the Pentagon over the Vietnam War.
On a stage in the Pentagon parking lot, speaker after speaker demanded the end of the war in Iraq and some called for President George W. Bush's impeachment. A flag-draped coffin was displayed near the stage bearing a picture of a young soldier killed in Iraq.
"We're here in the shadow of the war machine," peace activist Cindy Sheehan said. "We need to shut it down."
Wearing a black ski cap, Sheehan said soldiers like her son, Casey, who was killed in Iraq, were being sent "to die for nothing."
A woman for the group that organized the protest told the cheering crowd, "Impeach Bush, impeach Cheney, impeach Gates." The latter references were to Vice President Dick Cheney and Defense Secretary Robert Gates.
Jonathan Hutto, a 29-year-old active-duty sailor who served in Iraq, urged the demonstrators to tell lawmakers "to get a backbone and spine" and stop the war.
The march began near the Vietnam War Memorial, just a few blocks from the White House, and proceeded across the Potomac River toward the Pentagon.
Smaller protests were held in other US cities and abroad, stretching to Tuesday's four-year anniversary of the Iraq invasion.
Overseas, tens of thousands marched in Madrid as Spaniards called not only for the US to get out of Iraq but to close the prison for terrorist suspects at Guantanamo Bay in Cuba. More than 3,000 people protested peacefully in Istanbul, Turkey, and about 1,000 in Athens, Greece.Güncelleme Tarihi: 20 Eylül 2018, 18:16