I must say that I was a little disappointed when I found out that the popular writing book The Art of War for Writers wasn't actually about warfare and effective battle scenes. Because I need some help in that area.
I found some great articles on not just medieval warfare, but many other aspects of speculative fiction such as dialogue, world-building, and naming characters at Writing-World.com. The one I needed this morning is called "The Numberless Hordes."
Does anyone else have any other good resources to share?