​​A controversial act of the Falklands conflict in 1982 was the sinking of the Argentine cruiser ARA General Belgrano by the British submarine HMS Conqueror.
 
The British government argued the Belgrano was a legitimate military target and its sinking was a proportionate response to ensure the safety of their forces. Some argued it wasn’t. The Government withheld from saying how they knew.
 
Forty-three years later the story can now be told, drawing upon first-hand accounts and declassified GCHQ SIGINT reports and Government documents to detail the circumstance faced by the Royal Navy on 2 May 1982, which prompted the Task Force Commander Rear Adm Sandy Woodward to exceed his authority.
 
This 40-page publication was written by a member of staff with the kind permission and assistance of the GCHQ History Department.
 
All profits from the sale of this publication will go to the armed forces charities SSAFA, Combat Stress and the National Signals Intelligence and Security Trust.
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Order via the website (preferably) or via email to nsistoffice@gmail.com (write PUBLICATION in the email header).