The third commander-in-chief also, whom Rome sent to Macedonia in 585, Quintus Marcius Philippus, that already-mentioned upright guest-friend of the king, was not at all equal to his far from easy task. He was ambitious and enterprising, but a bad officer. His hazardous venture of crossing Olympus by the pass of Lapathus westward of Tempe, leaving behind one division to face the garrison of the pass, and making his way with his main force through impracticable denies to Heracleum, is not excused by the fact of its success. Not only might a handful of resolute men have blocked the route, in which case retreat was out of the question; but even after the passage, when he stood with the Macedonian main force in front and the strongly-fortified mountain- fortresses of Tempe and Lapathus behind him, wedged into a narrow plain on the shore and without supplies or the possibility of foraging for them, his position was no less desperate than when, in his first consulate, he had allowed himself to be similarly surrounded in the Ligurian defiles which thenceforth bore his name. But as an accident saved him then, so the incapacity of Perseus saved him now. As if he could not comprehend the idea of defending himself against the Romans otherwise than by blocking the passes, he strangely gave himself over as lost as soon as he saw the Romans on the Macedonian side of them, fled in all haste to Pydna, and ordered his ships to be burnt and his treasures to be sunk. But even this voluntary retreat of the Macedonian army did not rescue the consul from his painful position. He advanced indeed without hindrance, but was obliged after four days' march to turn back for want of provisions; and, when the king came to his senses and returned in all haste to resume the position which he had abandoned, the Roman army would have been in great danger, had not the impregnable Tempe surrendered at the right moment and handed over its rich stores to the enemy. The communication with the south was by this means secured to the Roman army; but Perseus had strongly barricaded himself in his former well-chosen position on the bank of the little river Elpius, and there checked the farther advance of the Romans. So the Roman army remained, during the rest of the summer and the winter, hemmed in in the farthest corner of Thessaly; and, while the crossing of the passes was certainly a success and the first substantial one in the war, it was due not to the ability of the Roman, but to the blundering of the Macedonian, general. The Roman fleet in vain attempted the capture of Demetrias, and performed no exploit whatever. The light ships of Perseus boldly cruised between the Cyclades, protected the corn-vessels destined for Macedonia, and attacked the transports of the enemy. With the western army matters were still worse: Appius Claudius could do nothing with his weakened division, and the contingent which he asked from Achaia was prevented