The Battle Of Ong Thanh (Vietnam War Footage) Documentary.

During this little known battle of the Vietnam War, 155 soldiers of the 2nd Battalion, 28th Infantry Regiment of the 1st Infantry Division, were ambushed by 1200-1400 VC's hiding in tall trees and lodged inside well-fortified bunkers.
The overwhelming assault included rifle fire and RPGs from trees, machine-gun fire from the ground and explosions from claymore mines