αὐτός—‘single-handed.’
πολιορκήσεται—‘to stand a siege.’ § 2 l. 13.
Ἀκαρνάνων depends on ξυστρατήγων, possessive gen.
σπένδονται—for the plur. verb, rare with a sing. subj. followed by μετά, see Thompson2 § 7. βουλόμενος following makes the conjecture σπένδεται probable.
τὸν μισθοφόρον ὄχλον—i.c. the Peloponnesian forces, exclusive of the Mantineans, the ἄρχοντες and ἀξιολογώτατοι. The Peloponnesian troops were mercenaries, it would seem. τὸν ξενικόν is prob. a mere gloss on μισθοφόρον.
διαβαλεῖν ἐς—‘to damage them with.’
Ἕλληνας—Steup places the comma at χρῄζων so as to make Ἕλληνας object of καταπροδόντες, i.e. the Ambraciots and the ὄχλος μισθοφόρος. This is better than ἐς τοὺς ἐκείνῃ . . Ἕλληνας together, i.e. the Ambraciots only, because (1) the Amphilochians too would be naturally included under the τούς, and they were not Ἔλληνες, (2) the mercenaries should certainly be included in the object of καταπροδόντες.