Zebras occupy eastern part of the Old World because of savannah on the Cutiemap at the west from Equestria and, well “Fallout: Equestria” where they are used as China. They are rather unstable feudal empire where small tribes live by the old ways under protection of mighty kings who have actual armies.
Another example of facing pegasi expansion ambitions. There is armor with flight talismans which are very hard to create right, light halberds to literally scythe enemies in a dogfight and darts to be extremely annoying for infantry