Operation Junction City, the largest US operation of the war, is launched. Four US divisions, as well as additional brigades, are involved in a massive search and destroy mission along the Cambodian Border.

American troops over-run much of the area before encountering signinficant resistance.

There are three major battles, each initiated by the Viet Cong: the first, at Ap BauBang; the second, at Fire Support Base Gold and the third at Ap Gu. In each battle, the Vietcong attack US forces and are repulsed, suffering very heavy losses.

In all, the Viet Cong lose 2,728 troops in the battles, while the US loses 282 troops. Nevertheless, the Viet Cong headquarters, one of the targets of the operation, is not captured and, once the US troops withdraw, the area is reoccupied by the Communists.