Briefly, nice job using black and white! I don’t know if this is the look you were going for, but to make it look even more like it was from that time period, I’d consider using a slower shutter speed and maybe adding some grain to the final image. Study images from that time period and try to see how your image compares to them. Right now, I think it looks a little too good for the tech they had then.
Composition-wise, more sky, less grass. The swords need a bit more room on the top.
I wish my local Civil War Re-enactment was still being held! They were getting some complaints because of the noise I think. Oh well; it would have been neat to try and replicate photos from the early days.
B&W images often benefit by increasing the clarity and contrast to make it “pop” Like @loganlamar said, I would try to add a little grain as well. The composition looks good too, but I think I would straighten it out a little. Maybe they were on a hill, but unless the riders look like they are leaning, I would make the horizon level. Very nice!