I thought 'Gaesatae' derived from 'spear'-something. Mori Gaesum, for example, means "Sea Of Spears".
On-topic, I usually have a hellenic infantry center ("backbone"), augmented with Persian/Eastern archers/auxilia and a lot of cavalry (Heavy hellenic and light local units). Unlike some, I do tend to utilize phalangites, although they do not form a large part of my armies.
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