On the 31 March 1967, American military forces were sent on a search and destroy mission as part of Operation Junction City in Tây Ninh Province, to the west of Saigon in South Vietnam. The forces were scheduled to make an airborne assault into an area near the border with Cambodia to secure some roads and US bases as well as to search and destroy Việt Cộng personnel in the surrounding area. The assault was scheduled for 30 March, but poor weather meant that one of the battalions did not land until the day after.
In the early afternoon of 31 March, American troops began their reconnaissance missions and one platoon was put into difficulty by a Việt Cộng attack that killed their commanding officer. A few hours later, an American company was attacked by a battalion-sized Việt Cộng force that put them in some difficulty until supporting artillery allowed them to withdraw. The Việt Cộng tried to exploit their advantage but were driven back by American firepower.
Before dawn the next day, the Việt Cộng launched their main attack on the American landing zone and fire support base at Ấp Gù with mortar-fire and an infantry charge. They managed to overrun a number of bunkers before the Americans called in air strikes and cluster bombs. This wore down the Việt Cộng and they were forced to withdraw by early morning on 1 April with heavy casualties.
The battle was a victory for US forces and Lieutenant Colonel Alexander M. Haig. The battle left 609 Việt Cộng killed according to US sources, with 5 captured and over 50 weapons of all types recovered, while the Americans lost 17 with 102 wounded. Lt. Col. Haig attributed the success to superior mortar and airborne firepower. He also claimed that the US victory proved the Việt Cộng were tactically and strategically naive and inflexible in large-unit open combat.