ἐκπολεμεῖν
From LSJ
Οὐκ ἔστι σιγᾶν αἰσχρόν, ἀλλ' εἰκῆ λαλεῖν → Silere non est turpe, sed frustra loqui → nicht Schweigen schändet, sondern Schwätzen auf gut Glück
Lexicon Thucydideum
bello petere, bellum inferre, to attack in war, make war on, 6.91.5,
PASS. hostis fieri, to become an enemy, 8.57.1, [Vat. Bekk. Goell. Did. Vatican Bekker Goeller Dindorf edition ἐκπεπολεμῶσθαι].