Ceterum agendae rei haud sane facilis patebat via; opus erat eadem omnis coniuratos nocte excubare, ne ab expertibus consilii impedirentur, forte autem alius alia  nocte excubabat.
But for carrying out the plan no easy road at all lay open; for it was necessary that all the conspirators should be on guard the same night, in order not to be interfered with by those who were not in the plot, but it happened that they  were on watch on different nights.
final_alignments\Quintus_Curtius_Alexander_Book8.json