why μνησθέντας?Thuc. 1.37.1

the whole sentence is ‘ἀναγκαῖον Κερκυραίων τῶνδε οὐ μόνον περὶ τοῦ δέξασθαι σφᾶς τὸν λόγον ποιησαμένων, ἀλλ᾽ ὡς καὶ ἡμεῖς τε ἀδικοῦμεν καὶ αὐτοὶ οὐκ εἰκότως πολεμοῦνται, μνησθέντας πρῶτον καὶ ἡμᾶς περὶ ἀμφοτέρων οὕτω καὶ ἐπὶ τὸν ἄλλον λόγον ἰέναι, ἵνα τὴν ἀφ᾽ ἡμῶν τε ἀξίωσιν ἀσφαλέστερον προειδῆτε καὶ τὴν τῶνδε χρείαν μὴ ἀλογίστως ἀπώσησθε.
I catch the backbone “ἀναγκαῖον…ἰέναι, ἵνα …”, and “μνησθέντας πρῶτον καὶ ἡμᾶς περὶ ἀμφοτέρων οὕτω” goes along with “ἡμᾶς..ἰέναι”, but why in pass part.?

thanks a lot!

I have found in LSJ B.II. that this verb has the meaning of make mention of
frequently in the passive aorist (+ περί τινος).

good mention! thanks!