The Queen and the Duke of Edinburgh at the Royal Hospital Chelsea in London
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Queen honours World War One volunteers at Royal Hospital Chelsea

28 June 2014 Last updated at 15:06 BST

The Queen has attended a service to honour volunteers who served in World War One, on the 100th anniversary of events that led to the outbreak of war.

The monarch, accompanied by the Duke of Edinburgh, attended a Solemn Drumhead Service of Remembrance at the Royal Hospital Chelsea in London.

The event took place on the centenary of the shooting of Archduke Franz Ferdinand in Sarajevo on 28 June 1914, which sparked the chain of events that led to war.

Nicholas Witchell reports.