τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
τρῐτοπροσώπως: Ἐπίρρ., ἐν τῷ τρίτῳ προσώπῳ, κατὰ τρίτον πρόσωπον, Θεοδοσ. Γραμμ. 143, 10.