A United States and South Vietnamese joint-service operation takes place against one of the best-fortified Viet Cong strongholds, located in the U Minh Forest in the Mekong Delta, 125 miles southwest of Saigon.
U.S. warplanes dropped bombs and napalm on the forest in preparation for the assault. Then, 6,000 South Vietnamese troops attacked Viet Cong positions in the forest. The U.S. Navy also participated in the operation–on December 29, the U.S. destroyer Herbert J. Thomas shelled suspected Viet Cong positions in the same area for seven hours. The operation ended on December 31, with 104 Viet Cong reported killed and 18 captured. The operation was considered a success in weakening the communist strength in the U Minh Forest.