Passage 4.25.6
καθίσταντό τε δὴ τοῖς Ἀκαρνᾶσιν ἐς ἀγῶνα καὶ ὁ τρόπος λέγεται τῆς μάχης γενέσθαι τοιόσδε. οἳ μέν, ἅτε πλήθει προέχοντες πολύ, οὐ χαλεπῶς περιέβαλον τοὺς Μεσσηνίους, πλὴν ὅσον αἱ πύλαι τε ἀπεῖργον κατὰ νώτου τοῖς Μεσσηνίοις γινόμεναι καὶ οἱ ἀπὸ τοῦ τείχους τοῖς σφετέροις προθύμως ἀμύνοντες· ταύτῃ μὲν δὴ μὴ περισχεθῆναι σφᾶς ἐκώλυε, τὰ δὲ πλευρὰ ἀμφότερα ἐκυκλώσαντο αὐτῶν οἱ Ἀκαρνᾶνες καὶ ἐσηκόντιζον πανταχόθεν.
And indeed the Acarnanians drew up for battle against them; and the manner of the fight is said to have been as follows. Since the Acarnanians were greatly superior in number, they easily surrounded the Messenians, except where the gates behind the Messenians blocked their rear, and where those from the wall zealously defended their countrymen. On that side alone they were prevented from being completely encircled. Yet on both flanks the Acarnanians closed around them, pelting them with missiles from every direction.