Congratulations on the CSA Infantry button, I found one about 4 years ago, but the back of it was gone. I am very proud of that find, and I know you are proud of yours too. One of my GGG Uncles fought and died in the same battle and area where I found mine. It sent chills down my back.... no joke pal.
Nice find, I picked up a cast I last year, they definitely aren't easy to find. Enjoy your find. Hit the pasture some more there may be more stuff there.