I assume that the Chalkaspides in the successor armies other than Pontus are represented by the Pezhetairoi. After all, chalkaspis means bronze shield, and guess what the phalangite shield was made of?
According to Goldsworthy, after being defeated by Sulla Mithridates made a deal with Sulla's political opponents (who were living in exile in Spain) in order to obtain Roman instructors for his army. Although Goldsworthy does not mention how far this instruction went (and it is a typical Roman cliche that their worst enemies had been trained by themselves), it does suggest a greater Roman influence on Pontic armies following the first Romano-Pontic war. It should be noted though that EB's description of the Pontic Thorakitai mentions that this type of troops was already in use in the area before the wars with Rome.
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