I'm still to play with a proper cavalry heavy faction BUTT:
-Mounts that lose their rider can still influence combat. Some are literally more powerful than the rider (Bandar's tigers, ****** spiders)
-A surviving mount makes rehiring a rider in the same province cheaper. Because you already have the mount. Exact mechanics of this currently unclear.
-Dimsounted riders keep fighting, you need to kill the knight after the horse, usually.
-Dismounted riders that survive combat can retreat and find new mounts automatically.
-Cavalry that retreats from combat with both rider and mount is almost guaranteed to make it back to a friendly province, this opens up possibilities. Maybe. Still need to test stuff.
-Spells can affect mounts and riders differently. Charm the rider and the beast remains, dominate the animal and you still have the (now ****** off) rider.
This simply from the top of my head. I'm pretty sure there's much more. Also diz:

This thing count has riding 4 mounts. Memetic potential over 9K. How kewl is that?

