τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
ἐπιτάχυνσις: -εως, ἡ, ἐπίσπευσις, Διωτογ. παρὰ Στοβ. 331. 19.