A ceremony has been held in Vietnam to mark the 50th anniversary of what became known as the Tet Offensive.
In 1968, on the eve of Vietnam's Lunar New Year holiday, known as Tet, soldiers from the north launched coordinated attacks on more than 100 cities in the south.
It was the attack that eventually led the United States to withdraw from Vietnam.
Al Jazeera's Wayne Hay has more.
