On 8 March, 1965, 3,500 United States Marines of the 9th Marine Expeditionary Brigade made an amphibious landing at Da Nang on the south central coast of South Vietnam, marking the beginning of a conflict that would haunt American politics and society for many years, even after the withdrawal of US forces in 1972. 

For the people of North Vietnam it was just another in a long line of foreign invaders. For two thousand years they had struggled for self-determination, coming into conflict during that time with the Chinese, the Mongols, the European colonial powers, the Japanese and the French. Now it was the turn of the United States, a far-away nation reluctant to go to war but determined to prevent Vietnam from falling into Communist hands. 

A Short History of the Vietnam War explains how the United States became involved in one of its longest wars, a conflict that, from the outset, many claimed it could never win.