Orcs are supposed to be Asians, mongols, right?
Horde comes from ordu
, a collection of two or more tumen
, a unit of 10,000 Mongol horsemen. They were also noted for their rapacious behavior, though it didn't spread their seed much if at all.
But the tactics orcs display in just about any fantasy setting are pathetic jokes compared to the Mongols. But that's true for most fiction period.