As the furnishing of the Persian fleet was left wholly to the subject nations of the Empire, so was its manning intrusted to them almost entirely. Phoenicians, Syrians, Egyptians, Cypriots, Cilicians, Lycians, Pamphylians, Carians, Greeks, equipped in the several costumes of their countries, served side by side in their respective contingents of ships, thereby giving the fleet nearly the same motley appearance which was presented by the army. In one respect alone did the navy exhibit superior uniformity to their sister service--the _epibatae_, or “marines,” who formed the whole fighting force of the fleet while it kept the sea, was a nearly homogeneous body, consisting of three races only (two of which were closely allied), namely, Persians, Medes, and Sacse. Every ship had thirty such men on board; all, it is probable, uniformly armed, and all animated by one and the same spirit. To this force the Persians must have owed it mainly that their great fleets were not mere congeries of mutually repellant atoms, but were capable of acting against an enemy with a fair amount of combination and singleness of purpose. When a fleet accompanied a land army upon an expedition, it was usually placed under the same commander. This commander, however, was not expected to adventure himself on board much less to take the direction of a sea-fight. He intrusted the fleet to an officer, or officers, whom he nominated, and was content himself with the conduct of operations ashore. Occasionally the land and sea forces were assigned to distinct commanders of co-ordinate authority--an arrangement which led naturally, to misunderstanding and quarrel.