Somewhere I read a translation of a letter to the commander of the Roman army complaining about his troops, they had been stopped at a small bridge by one naked Viking.a Bezerker I presume as they usually wanted to die for various reasons and from records they fought naked and to the end to go to Valhalla in glory. One man held them at the bridge for three hours so his fellow troops could escape. I think I found it Gutenberg press or maybe Internet Arvhive
I’m familiar with that legend. And most of the folks north of the Danube we think were from Scandinavia. Genetic DNA advancements are getting us there with archeological finds. My guess is that almost any mythology has a core root of some truth in it.