One of my Chinese friends said that the Jin troops rode 5 horse at once and charged as a very heavy cathaprac.
Yue Fei used a special halberd and cut off the horses legs. The riders fell off their horses and died without having to be slaughtered further. The height of the horse and the weight of their armor along with the fall, killed the Jin riders.
Awesome. That's what I would call time saving.
Where can I learn more about this?