Alexander the Great and his Macedonian army was composed of many groups like Thessalians and Macedonians. Greeks were a small portion of it:
"The Greek cavalry was not considered as effective or versatile as the Thessalian and Macedonian cavalry."
"The Greek cavalry was not considered as effective or versatile as the Thessalian and Macedonian cavalry."
I hesitated using “Greeks”, but then stuck with the common parlance.