I was just there July 24th! There is a statue of Bryhtnoth, and one can see the alleged island and tidal inlet (although its all rather hard to find and not prominent). I visited Essex for 2 days as my ancestors came from there 400 years ago, I also visited the alleged site of the Battle of Assandun in 1016 (near Hadstock) and the Peasant's Rebellion battle site in Norsey Wood (1381).

What I don't understand is that the Angles, Saxons, Jutes, Frisians, etc CAME from Denmark (esp. Angles and Jutes), so weren't they fighting their relatives? Another theory is that displacement of "Anglo Saxons" left a void in Denmark, filled by Scandinavian people, that "Viking" was a word for any raider or person that spoke Norse (which may have been a mix of people). In any case, most of the male haplotypes in England are R1B ("Anglo Saxon", more or less Germanic) and much less haplotype I "Scandinavian".

Maybe the answers are in that hilarious Netflix show "Norsemen", which takes place in 790 AD (while everyone speaks in modern psychobabble)

And I thought you were strictly a music writer?