The pictures have me thinking of the monument for the Battle of Bloody Marsh in the US
https://www.nps.gov/places/bloody-marsh.htm
https://en.wikipedia.org/wiki/Battle_of_Bloody_Marsh#/media/File:Bloody_Marsh,_St._Simons_Island,_Georgia,_USA,_2015.jpg
I watched most of a YT vid about the Battle of Crug Mawr, but it doesn’t seem postworthy, and have yet to scare up a source that would work as a post.
https://www.youtube.com/watch?v=BR0C8DFJN40
https://search.brave.com/search?q=Battle+of+Crug+Mawr+1136
