τὸ πλῆθος οὐκ εὐαρίθμητον ἦν → the crowd wasn't easy to count, the crowd was not small, it was not a small crowd
[Seite 913] ἡ, = σόος, heftige, schnelle Bewegung, Hesych., zw.
σοῦσις: -εως, ἡ, ἴδε σοῦς.