Passage 4.18.1
Μεσσήνιοι δὲ ὡς ἐς τὴν Εἶραν ἀνῳκίσθησαν, τῆς δὲ ἄλλης ἐξείργοντο πλὴν ὅσον σφίσιν οἱ Πύλιοι τὰ ἐπὶ θαλάσσῃ καὶ οἱ Μοθωναῖοι διέσωζον, ἢ ἐλῄστευον τήν τε Λακωνικὴν καὶ τὴν σφετέραν, πολεμίαν ἤδη καὶ ταύτην νομίζοντες· ἄλλοι τε δὴ συνίσταντο ἐς τὰς καταδρομάς, ὡς ἕκαστοι τύχοιεν, καὶ Ἀριστομένης δὲ τοὺς περὶ αὑτὸν λογάδας ἐς τριακοσίων ἀριθμὸν προήγαγεν.
When the Messenians had withdrawn into Eira and were shut out from the rest of their land except for the parts along the sea preserved for them by the Pylians and the Methonaeans, they began raiding both Laconia and their own territory, now regarding even this land as hostile. They gathered together in separate bands, as chance might allow; and Aristomenes himself assembled his chosen followers, numbering three hundred, and led them forth.