Σακῶν δὲ ἰδιώτης ἀνὴρ ἀπέλιπεν ἄρα τῷ ἵππῳ τοὺς ἄλλους ἵππους ἐγγὺς τῷ ἡμίσει τοῦ δρόμου.
What is the meaning of ἄρα here?
It’s an attention-getter, very striking in Xenophon; cf. LSJ A.I.2. With particles it’s better to think in terms of function than of meaning; they don’t translate well.