On 24 June 1969, the North Vietnamese communists assaulted the strategic Muong Soui all-weather airfield on Route 7 with four battalions stiffened by PT-76 tanks.
On 24 June 1969, the North Vietnamese communists launched Operation Toan Thang. They assaulted the strategic Muong Soui all-weather airfield on Route 7 with four battalions stiffened by PT-76 tanks.