| Operation Muscatine | |||||||
|---|---|---|---|---|---|---|---|
| Part of the Vietnam War | |||||||
 Vietnamese detainees during Operation Muscatine | |||||||
| |||||||
| Belligerents | |||||||
 United States |
 Viet Cong | ||||||
| Units involved | |||||||
|
3rd Brigade, 4th Infantry Division 196th Infantry Brigade 198th Infantry Brigade 11th Infantry Brigade |
406th Sapper Battalion 83rd Local Force Battalion 48th Local Force Battalion | ||||||
| Casualties and losses | |||||||
| 25 killed |
US body count: 645+ killed 7 captured | ||||||
| 347-504 civilians killed in the My Lai Massacre | |||||||
Operation Muscatine was a security operation conducted during the Vietnam War by the US Army in Quảng Ngãi Province, South Vietnam from 18 December 1967 to 10 June 1968. During this operation on 16 March 1968 the 1st Battalion, 20th Infantry Regiment and the 4th Battalion, 3rd Infantry Regiment carried out the My Lai Massacre.