Wiki:
The wind horse is an allegory for the human soul in the shamanistic tradition of Central Asia. In Tibetan Buddhism, it was included as the pivotal element in the center of the four animals symbolizing the cardinal directions and a symbol of the idea of well-being or good fortune. It has also given the name to a type of prayer flag that has the five animals printed on it.
The national emblem of Mongolia:
Logical conclusion:
Sorry guys, no versus. As soon as the army sees talking flying ponies, they'll all get off their steeds and start praying.
Edit: In fact I'm ready to start thinking that the OP's situation actually happened.
Edit 2: Be proud, guys. The Golden Horde were also bronies.