Sabaton is a Swedish power metal band. All of their songs are about history and they are mostly based on the WWII. I'm a fan of this band since 2010 and I'm sure metal fans on this forum will be interested. Here's one of their most famous songs, Primo Victoria. It's about D-Day. https://www.youtube.com/watch?v=IrJAwCBbnuc
Can't say I listen to metal often (little Metallica and System of a Down when working out) but the content is interesting and can't complain of a little history for the younger generation.
I know, I kind of like Halestorm for example , but I prefer small bands like Hateshpere (from Denmark) . https://www.youtube.com/watch?v=NPg3im9JAPA