Passage 5.4.8
κατὰ δὲ τὴν Ἄγιδος ἐπιστρατείαν ἐς τὴν γῆν καὶ τὴν προδοσίαν τὴν Ξενίου μάχῃ μὲν περὶ Ὀλυμπίαν νικῶσιν οἱ Ἠλεῖοι καὶ τροπὴν ἐργασάμενοι τῶν Λακεδαιμονίων ἐκ τοῦ περιβόλου σφᾶς ἐξήλασαν τοῦ ἱεροῦ· χρόνῳ δὲ ὕστερον ἐπαύθη σφίσιν ὁ πόλεμος κατὰ τὰς συνθήκας ἃς ἐγὼ πρότερον ἔτι ἐν τῷ λόγῳ τῷ ἐς Λακεδαιμονίους ἐδήλωσα.
During the military expedition of Agis into their territory and the treachery of Xenias, the Eleans prevailed in battle around Olympia, defeating the Lacedaemonians and driving them in flight from the sacred precinct. Afterward, within a period of time, the war was ended according to the terms of the treaty which I previously explained in my account of the Lacedaemonians.