- 1815 20 Mar Switzerland's 'perpetual neutrality' is guaranteed by the Congress of Vienna.
- 1933 20 Mar The first Nazi concentration camp is completed at Dachau, near Munich.
- 2003 20 Mar 'Operation Iraqi Freedom', the invasion of Iraq by US and British forces, begins with airstrikes.
World War One Centenary
- Find out more about how the BBC is covering the World War One Centenary, and see the latest programmes and online content
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