Video: 'Vietnam: The Ten Thousand Day War - Tet! [7/13]' (Apr. 1, 1968, at 38:05)

(Monday, April 1, 1968, 7:00 a.m. Saigon Standard Time; during the Battle of Khe Sanh, part of the Vietnam War, the Indochina Wars and the Cold War) — Operation Pegasus, an advance by U.S. troops along Route 9 to relieve the siege of the Marine base at Khe Sanh, began today.

In mid-March, the Marines realized that, like a quietly receding tide, the North Vietnamese were leaving Khe Sanh.