does not ebb and flow seven times a day at stated times, as is reported, but the current changing irregularly, like the wind, now this way now that, is hurried along like a torrent rolling headlong down a steep mountain, so that no quiet is given to vessels there day or night. But not only did so perilous a station receive his ships, but the town was strong and impregnable, covered on one side by the sea, and very well fortified on the other towards the land, secured by a strong garrison, and above all, by the fidelity of the praefects and principal men, which was wavering and unsettled at Oreum. Though the business had been rashly undertaken, the Roman still acted with prudence, in so far as he speedily gave up the attempt, after he had seen all the difficulties which surrounded him, that he might not waste time, and passed his fleet over from thence to Cynus in Locris, the port of the town of Opus, which is one mile distant from the sea. 7. Philip had received notice of this from Oreum, by the signal fires; but through the treachery of Plator they were raised from the watch-tower at a later period. As he was not a match for the enemy's forces at sea, it was difficult for him to approach the island; and thus, by delay, the opportunity was lost. He moved with promptness to the assistance of Chalcis as soon as he received the signal. For although Chalcis is a city of the same island, yet it is separated from the continent by so narrow a strait, that they communicate by means of a bridge, and the approach to it is easier by land than by water. Philip therefore, going from Demetrias to Scotussa, and setting out thence at the third watch, dislodged the guard, put to flight the Aetolians who kept the pass of Thermopylae, and drove the enemy in confusion to Heraclea, marching in one day to Elatia in Phocis, a distance of above sixty miles. Almost on the same day the town of Opus was taken and plundered by Attalus. Sulpicius had given it up to the king because Oreum had been plundered a few days before by the Roman soldiers, the royal soldiers not having shared the booty. The Roman fleet having retired thither, Attalus, who was not aware of Philip's approach, wasted time in levying contributions from the principal inhabitants, and so sudden was his coming, that had he not been descried by some Cretans, who happened to go farther from the town than usual in quest of forage, he might have been surprised. He fled hastily to the sea and his ships, without arms, and in the greatest disorder. Just as they were putting off from the land Philip arrived, and even from the shore created much alarm among the mariners. He returned thence to Opus, accusing both gods and men, because he had lost an opportunity of so great importance, almost snatched from his hands. He also reproached the Opuntians with the like anger, because they had, immediately on sight of the enemy, made almost a voluntary surrender, though they might have prolonged the siege till his arrival.