τετραφαλαγγία
From LSJ
νῆα μὲν οἵ γε μέλαιναν ἐπ' ἠπείροιο ἔρυσσαν ὑψοῦ ἐπὶ ψαμάθοις, ὑπὸ δ' ἕρματα μακρὰ τάνυσσαν → they pushed the black ship up over the sand onto dry land and placed long beams under her
English (LSJ)
ἡ,
A corps of four phalanxes or a phalanx in four divisions, i.e. of 16,384 men, Plb.12.20.7, Arr.Tact.28.6, Ael.Tact.36.6, Polyaen.4.7.12.
