ἱππομαχεῖν
From LSJ
Δεῖ τοὺς φιλοῦντας πίστιν, οὐ λόγους ἔχειν → Non bene stat intra verba amicorum fides → Vertrauen müssen Freunde sich, viel reden nicht
Greek > English (Woodhouse Verbs Reversed)
(see also ἱππομαχέω): fight cavalry battle
Lexicon Thucydideum
equestre praelium committere, to engage in a cavalry battle, 4.124.3.