Passage 4.10.7
τὸν δὲ πόλεμον ἐπὶ τῆς Ἀριστοδήμου βασιλείας ἐπολέμουν λῃστείαις τε κατʼ ὀλίγους ἀεὶ καὶ περὶ τὴν ὡραίαν καταδρομαῖς ἐς τὴν ἀλλήλων χρώμενοι, συνεσέβαλλον δὲ καὶ παρὰ τῶν Ἀρκάδων τοῖς Μεσσηνίοις ἐς τὴν Λακωνικήν· Ἀργεῖοι δὲ προαναφῆναι μὲν τὸ ἐς τοὺς Λακεδαιμονίους ἔχθος οὐκ ἠξίουν, γινομένου δὲ ἀγῶνος παρεσκευάζοντο ὡς μεθέξοντες.
During the reign of Aristodemus, warfare consisted of continual raiding in small bands upon one another and incursions into each other's territories around harvest-time. The Messenians also made joint invasions into Laconia, supported by contingents from the Arcadians. The Argives, on the other hand, deemed it improper to openly declare their hostility toward the Lacedaemonians beforehand, yet they held themselves ready to join the conflict once it had begun.