The beginning of the war:
Just when the people of Vietnam were free from the union with Japan, France wanted to get a union with Vietnam, because they have had it before. The northern Vietnam did not like that so the communist group of Ho Chi Minhs (also called FNL) broke the negotiation between France, and then the “first” war started. The war between France and North-Vietnam last in 8 years, because France had underrated Vietnam and had to back out.
The “second” and the most famous war:
Then the war between northern Vietnam and southern Vietnam starts, because FNL wants to be communists, and the south of Vietnam does not. The northern Vietnam were the best so far in the war, so the USA helps the southern Vietnam because they are afraid the communists and the domino theory. (The domino theory consists on that the USA thought if one land is communist, many other will be it too.)
The North-Vietnam was good fighters, so the South-Vietnam had to do something quick. So they put together small villages into small towns because it would be easier to defend them against FNL. But they should not have done that, because when North-Vietnam had won a town they get all there’s weapons, and a bomb would kill more people.
In 1964 the most famous battle in the Vietnam War took place on the Tonkin-bay. It is famous because it was here American boats where attacked with torpedoes from North-Vietnam. And after this there were many big battles in Vietnam. Like in 1972 there were over 120000 soldiers who attacked South-Vietnam. But finally on the 27th of January 1973 the war was over.