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
Wikipedia seems to have a good summary of that battle:
https://en.wikipedia.org/wiki/Battle_of_Crug_Mawr