- There was another big anti-Vietnam war demonstration on 27 October 1968. An estimated 25,000 took part in the march and once again trouble flared outside the US embassy in Grosvenor Square.
But security was very tight. There were 1,000 police outside the embassy and officers lined the streets of the march to prevent a repeat of the trouble in March.
The last American troops left Vietnam on 29 March 1973.
The following year there were frequent violations of the peace treaty.
In 1975, fullscale warfare resumed between North and South Vietnam -without American intervention. In 1976 the first elections were held to a National Assembly, finally reuniting North and South.