OK - here are the different horses that I have spare. They're being menaced by some Empire handgunners for scale purposes.
The three on the top row are TB Line horses from the Mongol range - the one second on the left has archer's legs moulded on. The bottom row are from Old Glory. I've got lots of each.
If you're wondering, the riders have all been converted into Hobgoblins and are currently riding Copplestone wolves.