§3.20.1τοῦ δ’ αὐτοῦ χειμῶνος οἱ Πλαταιῆς (ἔτι γὰρ ἐπολιορκοῦντο ὑπὸ τῶν Πελοποννησίων καὶ Βοιωτῶν) ἐπειδὴ τῷ τε σίτῳ ἐπιλείποντι ἐπιέζοντο καὶ ἀπὸ τῶν Ἀθηνῶν οὐδεμία ἐλπὶς ἦν τιμωρίας οὐδὲ ἄλλη σωτηρία ἐφαίνετο, ἐπιβουλεύουσιν αὐτοί τε καὶ Ἀθηναίων οἱ ξυμπολιορκούμενοι πρῶτον μὲν πάντες ἐξελθεῖν καὶ ὑπερβῆναι τὰ τείχη τῶν πολεμίων, ἢν δύνωνται βιάσασθαι, ἐσηγησαμένων τὴν πεῖραν αὐτοῖς Θεαινέτου τε τοῦ Τολμίδου ἀνδρὸς μάντεως καὶ Εὐπομπίδου τοῦ Δαϊμάχου, ὃς καὶ ἐστρατήγει·
During the same winter, the Plataeans (for they were still being besieged by the Peloponnesians and Boeotians), since they were hard pressed by the failure of their food supply, and there was no hope of help from Athens, nor did any other means of safety appear, planned—both themselves and the Athenians who were besieged with them—first of all for everyone to go out and scale the enemy’s walls, if they should be able to force their way through. This attempt was suggested to them by Theaenetus, son of Tolmides, a seer, and Eupompides, son of Daimachus, who was also a general.
§3.20.2ἔπειτα οἱ μὲν ἡμίσεις ἀπώκνησάν πως τὸν κίνδυνον μέγαν ἡγησάμενοι, ἐς δὲ ἄνδρας διακοσίους καὶ εἴκοσι μάλιστα ἐνέμειναν τῇ ἐξόδῳ ἐθελονταὶ τρόπῳ τοιῷδε.
Then, about half of them shrank back from it, thinking the danger too great; but about two hundred and twenty men voluntarily persevered in the plan of escape, in the following manner.
§3.20.3κλίμακας ἐποιήσαντο ἴσας τῷ τείχει τῶν πολεμίων· ξυνεμετρήσαντο δὲ ταῖς ἐπιβολαῖς τῶν πλίνθων, ᾗ ἔτυχε πρὸς σφᾶς οὐκ ἐξαληλιμμένον τὸ τεῖχος αὐτῶν.
They made ladders equal in height to the enemy's wall; and they measured this by the courses of the bricks, at a point where the wall happened to have no plastering on the side facing them.
ἠριθμοῦντο δὲ πολλοὶ ἅμα τὰς ἐπιβολάς, καὶ ἔμελλον οἱ μέν τινες ἁμαρτήσεσθαι οἱ δὲ πλείους τεύξεσθαι τοῦ ἀληθοῦς λογισμοῦ, ἄλλως τε καὶ πολλάκις ἀριθμοῦντες καὶ ἅμα οὐ πολὺ ἀπέχοντες, ἀλλὰ ῥᾳδίως καθορωμένου ἐς ὃ ἐβούλοντο τοῦ τείχους.
Many counted the courses at the same time, and though some were likely to make a mistake, the majority would hit upon the true calculation, especially since they counted many times, and at the same time were not far off, but the wall they wished to look at was easily visible.
§3.20.4τὴν μὲν οὖν ξυμμέτρησιν τῶν κλιμάκων οὕτως ἔλαβον, ἐκ τοῦ πάχους τῆς πλίνθου εἰκάσαντες τὸ μέτρον.
In this way, then, they got the measure of the ladders, estimating the height from the thickness of a brick.