Philip, having at first fixed his camp at Bryanium, marched thence through cross-roads, and gave a sudden alarm to the enemy.

The Romans, on this, removed from Pluvina, and pitched their camp near the river Osphagus.

The king also sat down at a small distance, forming his intrenchment on the bank of a river which the inhabitants call Erigonus.

Having there received certain information that the Romans intended to proceed to Eordaea, he marched away before them, in order to take possession of the defiles, and prevent the enemy from making their way, where the roads are confined in narrow straits.

There, with great haste, he fortified some places with a rampart, others with a trench, others with stones heaped up instead of walls, others with trees laid across, according as the situation required, or as materials lay convenient; and thus a road, in its own nature difficult, he rendered, as he imagined, impregnable by the works which he drew across every pass.