Persia, the Last of the Persian Armies

The Persians are the last of the armies fielded on principles that were developed in sumeria and nurtured by peoples like the assyrians and the babylonians before them. They're inheritors to a 25 hundred year old military tradition, is what historian nigel talus says. And once you get rid of the very large numbers that the classical authors give you, turning them into orks, you realize how good they must have been at what they did. By darius, i don't know if you could say it's the t of military development, but they're still fighting at a very high level.