τάξιν ἐρημοῦν

From LSJ

ἔτυχες εἰς τὴν μάχην ὑπὸ τοῦ στρατηγοῦ πεμφθεὶς → you happened to be sent into the battle by the general

Source

Greek > English (Woodhouse)

abandon one's post, desert one's post