συστρατεύειν
From LSJ
Ἡ δ' ἐμὴ ψυχὴ πάλαι τέθνηκεν, ὥστε τοῖς θανοῦσιν ὠφελεῖν → My soul died long ago so that I could give some help to the dead
Greek > English (Woodhouse Verbs Reversed)
(see also συστρατεύω): join in a campaign, join in an expedition, on an expedition