Whether you’re writing historical fiction,fantasy, or even modern era — at some point your characters will violently clash with an opponent. On his blog, Assaph has a series of article on writing believable and engaging fight scenes — from individual duels to grand battles, from history to modern thrillers.
If you have any sort of action in your novels and don’t want your readers throwing the book across the room with the exclamation “no way!”, we suggest you read these articles. Starting with historical and fantasy context:
https://egretia.com/2018/11/27/making-fights-realistic-in-historical-fiction-and-fantasy/
And in general about action scenes, fighting and otherwise:
https://felixthefox.wordpress.com/2018/07/11/action-choreography-for-novels/