Got to have watchtowers for those pesky rock climbing mongolian assassins. A nice smooth brick surface slows them down and slips them a bit like heavy beatles clamoring up glass. /s
It's a few hundred years later, after the Hittites have disappeared, but Assurnasirpal II claims to have scaled a mountain peak "like the point of an iron dagger" to slaughter everyone inside the fortress at the top. Twice.
They might actually be related. The huns originated from east of the Volga river (so east of the Scythians) and recent research identified genetic links to ancient Mongols