συναχθῆναι

From LSJ

γλυκύ δ᾽ἀπείρῳ πόλεμος, πεπειραμένων δέ τις ταρβεῖ προσιόντα, νιν καρδίᾳ περισσῶς → A sweet thing is war to the inexperienced, but anyone who has tasted it trembles at its approach, exceedingly, in his heart (Pindar, for the Thebans, fr. 110)

Source

Greek Monotonic

συναχθῆναι: απαρ. αορ. αʹ του συνάγω.

Russian (Dvoretsky)

συναχθῆναι: inf. aor. pass. к συνάγω.