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

CHAPTER LI

καὶ ὑποπτευσάντων—the second participle gives the cause of the first: cf. note on ch. 97, 9.

ἐς αὑτούς—‘against them’ sc. the Athenians, with νεωτεριεῖν. Another possible reading is ἐς αὐτούς, ‘having formed some suspicion with regard to them’ viz. the Chians. For ἐς cf. Ar. Plut. 361, σὺ μηδὲν εἰς ἔμ᾽ ὑπονόει τοιουτονί.

ποιησάμενοι—‘having effected for themselves’ i.e. stipulated for. The sense is that, before dismantling their works, they obtained the strongest guarantees which they could that the Athenians would do them no injury. πρὸς Ἀθηναίους—‘in regard to the Athenians’, i.e. between the Athenians and themselves. πίστεις καὶ βεβαιότητα—‘pledges and security’.

ἐκ τῶν δυνατῶν—‘to the best of their power’: ii. 3, ὡς ἐκ τῶν δυνατῶν.