πείσαντες “κ.τ.λ.”: cp. 102.—“πρὸς ἰσχύος κράτος. ἰσχύς” is the physical strength at the disposal of the captors; “κράτος”, the mastery which this strength will give them. Thus the gen. defines the source of the “κράτος”. Cp. Aesch. P. V. 212“ὡς οὐ κατ᾽ ἰσχὺν οὐδὲ πρὸς τὸ καρτερὸν” | “χρείη, δόλῳ δὲ τοὺς ὑπερσχόντας κρατεῖν”: where “κατ᾽ ἰσχύν” expresses the available strength, and “πρὸς τὸ καρτερόν” the triumphant exertion of it. (As to “πρὸς ἰσχύος χάριν” in Eur. Med. 538, see on Soph. Ant. 30.) For πρὸς cp. 90 n.