No, this can't even be called a battle.
It's a massacre.
But those knights without helmets, clearly human in appearance, cheerily ride and slash through, occasionally blowing sharp whistles. The cavalry formation changes swiftly, leaving the counterattacking demons struggling to catch their tails. Their coordination is seamless, even allowing them to counter these counterattacking demons in waves.
After scattering the demon formations, they instantly split up, bypassing the river valley banks. Only from a high vantage can one see how they interweave their formations, with knights pressed tightly to their horses' backs, kicking the horses' bellies. They circle along the scoured delta, suddenly charging from behind and stabbing the demons in the buttocks while the demons are still lunging at their dust.
The battlefield, through constant cavalry interweaving - scattering - interweaving tactics, finds itself divided.
