Verified Answer :

The answer is true.
It happened around November 14 and November 18, 1965 in the Central
Highlands of Vietnam.  Though the
Americans and South Vietnamese were able to repel attacks by the North
Vietnamese, a surprise attack by the North Vietnamese launched an ambush on the
Americans that was successful.  It gave
the North the inspiration to keep fighting because they believe that they had
what it takes to win.