At the entry of William and Mary into London he is said to have served as a volunteer trooper "gallantly mounted and richly accoutred."
In warfare it was customary for knights who were thus allied to appear similarly accoutred and bearing the same badges or cognisances, to the end that their enemies might not know with which of them they were in conflict, and that their friends might be unable to accord more applause to one than to the other for his prowess in the field.
None the less, till Marathon the Persians were successful in discomfiting every enemy before he could close, whether that enemy consisted of similarly accoutred bowmen (as the Medes), of cavalry armed with the lance (as the Lydians), or of heavily armoured warriors (as the Babylonians, Egyptians and Greeks).