If they do, order your cavalry to dismount - it's actually faster. A cavalry charge at this point will ensure your horses don't get stuck climbing up hills. When fighting in especially mountainous terrain, order ALL your units to wait until you can see enemy lines advancing over the closest hills. The only drawback of an army dependent on Mamlukes (or Swadian Knights, for that matter) is terrain - heavy cavalry are amazing over relatively flat or moderately rolling terrain (like the deserts of the Sarranid nation), but put a river or hills in their way, and you'll have a blood bath on your hands. They are infantry only, so get a good Kaergit and Sarranid troop mix with Veagirs and Swadia infantry for best success. Even if they do get stopped up, you should have no problem letting them fight from a standstill. They will mow over just about any infantry units in a first-time cavalry charge, including most spear-wielding infantry (usually the bane of cavalry). Don't worry too much about friendly fire, a few arrows will do next to nothing to a Sarranid Mamluke. Take advantage of excellent Sarranid ranged units every battle - begin by advance your archers just into enemy range and raining arrows with a simultaneous cavalry all-out charge.

Mount and blade warband sarranid