C.E. Graves, Commentary on Thucydides: Book 4

CHAPTER CXXXIV

τῆς Ὀρεσθίδος—‘in the territory of Ὀρέσθειον’: v. 64, ἐχώρουν δὲ ἐς Ὀρέσθειον τῆς Μαιναλίας. Pausanias says that the town of Oresthasium, which is probably the same place, was on the way leading from Megalopolis to Pallantium and Tegea. The battle seems to have been fought in the valley of the Alpheus, near where Megalopolis was afterwards built; see Arnold.

νίκη—Poppo suggests ἡ νίκη. ἀμφιδήριτος is used by Polybius, but only here in classical Greek.

κέρας τὸ καθ᾽ αὑτούς—apparently each army routed the adversary's allies. ἀγχωμάλου—vii. 71, ἀγχώμαλα ἐναυμάχουν: iii. 49, ἐγένοντο ἐν τῇ χειροτονίᾳ ἀγχώμαλοι. ἀφελομένης—‘broke off, stopped’: Aesch. Pers. 428, νυκτὸς ὄμμ᾽ ἀφείλετο.

ἐπηυλίσαντο—as being masters of the field: iii. 5, οὔτε ἐπηυλίσαντο οὔτε ἐπίστευσαν σφίσιν αὐτοῖς.