Fursan

The warriors of Duke Álmos were much encouraged and they at once sounded on all sides the trumpets of war, and both lines of foes came together and they began to fight each other fiercely, and many Ruthenes and Cumans were slain.

&mdash; Gesta Hungarorum

Overall strategy
While they may not have mounts as those used by Persian or Turkish nations, nor have they equipment as sophisticated as those used by the Asian or Roman factions, Fursan are a class of Arab cavalry that cannot be underestimated. Fiercely loyal and fairly well to do in dishing out damage (as well as tanking it) Fursan constitute a class of Arab cavalryman, capable of punishing light infantry armies as well as swarming heavier foes if so needed.

The use of Fursan thus is as a form of assault cavalry, meant to be used to take out crossbowmen and other missile units, leaving the rest of your Arab armies — consisting of light cavalry and infantry units — unscathed so that they can then do their work on the field unimpeded by their foes. They are still a form of heavy cavalry on par with a Frankish scara and so should be used aggressively against any light elements which are not properly covered either by heavy cavalry or infantry.