Leontius saw that it was likely that the king would attain his object, and the Aetolians be unable to resist him, for the double reason of the speed and unexpectedness of the Macedonian attack, and of his having gone to Thermus; for the Aetolians would never suppose him likely to venture to expose himself so rashly, seeing the strongly fortified nature of the country, and would therefore be sure to be caught off their guard and wholly unprepared for the danger. Clinging still to his purpose, therefore, he advised the king to encamp on the Achelous, and rest his army after their night’s march; being anxious to give the Aetolians a short respite to make preparations for their defence. But Aratus, seeing clearly that the opportunity for action was fleeting, and that Leontius was plainly trying to hinder their success, conjured Philip not to let slip the opportunity by delaying. The king was now thoroughly annoyed with Leontius: and accepting the advice of Aratus, continued his march without interruption; and, after crossing the Achelous, advanced rapidly upon Thermus, plundering and devastating the country as he went, and marching so as to keep Stratus, Agrinium, and Thestia on his left, Conope, Lysimachia, Trichonium, and Phytaeum on his right. Arrived at the town of Metapa, which is on the borders of the Trichonian Lake, and close to the narrow pass along it, about sixty stades from Thermus, he found it abandoned by the Aetolians, and occupied it with a detachment of five hundred men, with a view of its serving as a fortress to secure both ends of the pass: for the whole shore of the lake is mountainous and rugged, closely fringed with forest, and therefore affording but a narrow and difficult path. He now arranged his order of march, putting the mercenaries in the van, next them the Illyrians, and then the peltasts and the men of the phalanx, and thus advanced through the pass; his rear protected by the Cretans: while the Thracians and light-armed troops took a different line of country, parallel to his own, and kept up with him on his right: his left being secured by the lake for nearly thirty stades.