ἀντιπολεμεῖν

From LSJ

ναύτης ὁ ἐν τῇ νηῒ μένων βούλεται τοὺς τέτταρας φίλους ἰδεῖν → the sailor staying on the ship wants to see his four friends

Source

Greek > English (Woodhouse Verbs Reversed)

(see also ἀντιπολεμέω): wage war against

Lexicon Thucydideum

bellum vicissim inferre, to wage war in turn, 3.39.2.
inter se bellare, to fight with each other, 1.23.2.