I found an account on google books of a battle that occurred in an arena in Vienna. The combatants were a lion, a tiger, a bear, a cow and her calf, and a horse. The lion and tiger went at each other first. The lion won, but it was a tough battle. The lion didn’t seem to know what to do with the bear next, but after a bit of confusion, the lion (still tired after its battle with the tiger) dispatched the bear fairly easily. The cow put up a surprisingly strong fight once its calf was threatened, but the lion still won.
The horse turned around and kicked the lion, knocking it away. The lion came in again at a slightly different angle, but the horse reacted the same, turning around and kicking the lion with its back legs. Apparently a horse kick to the head is enough to kill a lion, because the second blow was fatal.
I wouldn’t have expected the horse to be the ultimate winner, but there you go.
Google book link for those who want the entire play-by-play: