Passage 9.13.7
τῶν μὲν δὴ ἓξ ἐς τοσοῦτον ἦν κεχωρισμένα τὰ βουλεύματα· προσγενομένης δὲ ψήφου τοῖς περὶ τὸν Ἐπαμινώνδαν τοῦ ἑβδόμου τῶν Βοιωταρχῶν, ὃς ἐφρούρει μὲν τὴν κατὰ τὸν Κιθαιρῶνα ἐσβολήν, ὄνομα δὲ ἦν οἱ Βραχυλλίδης, τούτου τοῦ ἀνδρός, ὡς ἐπανῆλθεν ἐς τὸ στρατόπεδον, προσθεμένου τοῖς περὶ τὸν Ἐπαμινώνδαν, τότε καὶ πᾶσιν ἐδέδοκτο ἀγῶνι διακρίνεσθαι.
The votes of the six commanders had thus far been equally divided. However, when the vote of the seventh Boeotarch, who was stationed to guard the passage by Cithaeron—his name was Brachyllides—was added to the side of Epaminondas upon his return to the camp, all agreed at last to decide the issue through battle.