Hundreds of thousands of pages of diaries from units from the First World War have been digitised and will be available to read online today.
The National Archives is publishing the first batch of unit diaries from France and Flanders as part of the organisations centenary programme.
The organisation is hoping that "citizen historians" will read the diaries to unearth new discoveries about life at war.
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Andy Murray was considering retirement before undergoing an operation in January.
Several minutes of disruption was caused to the event, which was attended by around 350 guests.