διαναυμαχεῖν
From LSJ
δι' ἐρημίας πολεμίων πορευόμενος → he marched on without finding any enemy, his route lay through a country bare of enemies
Greek > English (Woodhouse Verbs Reversed)
(see also διαναυμαχέω): engage in a sea fight, fight a sea battle
Lexicon Thucydideum
navali proelio decertare, to fight a naval battle, 7.60.2. 8.27.1. 8.78.1 [ubi Vat. where Vatican manuscript ναυμ.]. 8.79.1. Ib. there. 6 [Vat. iterum Vatican again ναυμ.]. 8.83.3.
