Tolkien’s backstories were all about every elf, dwarf, man, and evil critters in the world fighting all the time, including against each other (War of the Kin Strife, etc), very much in the traditions of Nordic sagas. :^)
I tried reading Tolkien once. Could get past the first few chapters.....................
Norse mythology, Celtic literature, English folklore, everything that Tolkien was an expert in went into his stories. Numenor was his take on Atlantis, a Greek/Egyptian legend. But it wasn’t all about war; just the interesting bits.