WHAT WAS A POH?

In brief, it was a creature of Chinese legend.  They looked like unicorns - they had single horns and equine characteristics.  Their bodies were white and their tales black.  However, they were fierce creatures.  Their teeth resembled a saw.  They had claws like a tiger's and they ate tigers and leopards.  It was said that you could use them as soldiers, though how exactly you could do this somewhat mystifies me.  Pohs were to be found, so the Chinese said, in Mongolia.