חֵיל פָּרַס וּמָדַי
The Persian and Medes jointly ruled over the empire. In the photo below from Persepolis both Persian and Median soldiers can be seen (the Persians have the fluted hats while the Medes have the round hats and boots).
In the image below a Mede soldier stand behind a Persian archer.
The image below of Persian archers originally decorated the palace at Shushan.