E.C. Marchant, Commentary on Thucydides: Book 3

Ποτιδανίαν—“situated exactly opposite to the only ford of the river Mórnos” (Woodhouse). The ancient name of the river was probably Daphnos. The town is at the extreme SW. of Apodotia, just over the border.

Κροκύλειον . . Τείχιον—Demosthenes marched to the NE. from Potidania into Apodotia, attacking the towns in succession. Both places have been identified (by Bazin and Woodhouse). Teichium is close to the border of Ophioneia.

Εὐπάλιον—now Sulés, near Potidania.

τὰ ἄλλα καταστρεψάμενος—i.e. the rest of Apodotia, before advancing into Ophionea. The Locrian light-armed troops had not yet turned up, and Demosthenes had gone only a very short way when he found it desirable to modify his plan considerably.

ἐς Ναύπακτον—as the best base for operating against Ophionea.