Passage 4.13.6
ἀρετῇ μὲν δὴ καὶ τολμήμασιν οὐδὲ τότε ἀπεδέησε τὰ τῶν Μεσσηνίων· ἀπέθανον δὲ οἵ τε στρατηγοί σφισιν ἅπαντες καὶ τῶν ἄλλων οἱ λόγου μάλιστα ἄξιοι. τὸ δὲ ἀπὸ τούτου μῆνας μέν που πέντε μάλιστα ἀντέσχον, περὶ δὲ τὸν ἐνιαυτὸν λήγοντα ἐξέλιπον τὴν Ἰθώμην, πολεμήσαντες ἔτη τὰ πάντα εἴκοσι, καθὰ καὶ Τυρταίῳ πεποιημένα ἐστίν· εἰκοστῷ δʼ οἱ μὲν κατὰ πίονα ἔργα λιπόντες φεῦγον Ἰθωμαίων ἐκ μεγάλων ὀρέων. Tyrtaeus, unknown location.
Indeed, even at that time the Messenians were not lacking in valor and daring deeds; yet all their commanders and those most worthy of mention among the others perished. After this event, they still resisted for approximately five months, but towards the conclusion of the year they abandoned Ithome, having fought throughout a total of twenty years, as Tyrtaeus also composed in his verses: "But in the twentieth year they fled, abandoning their rich fields, Away from the lofty mountains of Ithome."