Closest I've seen to that maneuver (gutting the horses) is when I sent my Velites Gladiators against Selucid Scythed chariots. I had paused the battle to check in on some cavalry that was gettin a phalanx up their butt and I looked over at my Gladiators and thought...damn, they're all dead already! But they weren't. When I unpaused they let the chariots pass over and then jumped up on the back to pull the riders off. If you haven't used the Gladiators, send them in against some chariots or elephants, they are fun to watch!