In the year 937, the idea of Englishness came close to being wiped off the face of the Earth as four armies faced off against the shield wall of the Anglo-Saxon king Athelstan in a brutal battle which left thousands dead. Author and historian Guy Walters talks to author Michael Livingston about why the Battle of Brunanburh was so pivotal for the English - and why the battle arouses such strong passions today that Livingstone had death threats after suggesting a location where it may have taken place. (Photo: Richard Cutts)