Vietnam War remained in the field for four days. Tellingly, South Vietnamese forces were again defeated in June 1965 at the Battle of Đồng Xoài. On 8 March 1965, 3,500 U.S. Marines were unilaterally dispatched to South Vietnam. This marked the beginning of the American ground war. U.S. public opinion overwhelmingly supported the deployment. The Marines' initial assignment was defensive. The first deployment of 3,500 in March 1965 was increased to nearly 200,000 by December. The U.S. military had long been schooled in offensive warfare. Regardless of political policies, U.S. commanders were institutionally and psychologically unsuited to a defensive mission. General William
1947–50 in the Vietnam War communist activity was coordinated worldwide. Thus, the attack on South Korea caused the U.S. to become more concerned about the Việt Minh insurgency in Vietnam. Việt Minh forces were estimated to have grown to 250,000 personnel, including 120,000 in regular units organized into divisions. The remaining troops were regional and popular and primarily concerned with defense and security. An estimated 15,000 Chinese, in both Vietnam and China, assisted the Việt Minh with training, technicians, and advisers. The French had about 150,000 soldiers in Vietnam. The pro-French Vietnamese army numbered about 16,000 The first U.S. military advisers to Vietnam arrived in