Among the Persian fleet at Aphetæ, on the other hand, the feeling prevalent was one of sanguine hope and confidence in their superior numbers, forming a strong contrast with the discouragement of the Greeks at Artemisium. Had they attacked the latter immediately, when both fleets first saw each other from their opposite stations, they would have gained an easy victory, for the fleet would have fled, as the admiral was on the point of ordering, even without an attack. But this was not sufficient for the Persians, who wished to cut off every ship among their enemies even from flight and escape.[189] Accordingly, they detached two hundred ships to circumnavigate the island of Eubœa, and to sail up the Eubœan strait from the south, in the rear of the Greeks,—and postponing their own attack in front until this squadron should be in position to intercept the retreating Greeks. But though the manœuvre was concealed by sending the squadron round outside of the island of Skiathos, it became known immediately among the Greeks, through a deserter,—Skyllias of Skionê. This man, the best swimmer and diver of his time, and now engaged like other Thracian Greeks in the Persian service, passed over to Artemisium, and communicated to the Greek commanders both the particulars of the late destructive storm, and the despatch of the intercepting squadron.[190] [189] Herodot. viii, 6. καὶ ἔμελλον δῆθεν ἐκφεύξεσθαι (οἱ Ἕλληνες)· ἔδει δὲ μηδὲ πυρφόρον, τῷ ἐκείνων (Περσῶν) λόγῳ, περιγενέσθαι. [190] Herodot. viii, 7, 8. Wonderful stories were recounted respecting the prowess of Skyllias as a diver.