ἱππομαχέω
From LSJ
τὸ γὰρ εὖ πράττειν παρὰ τὴν ἀξίαν ἀφορμὴ τοῦ κακῶς φρονεῖν τοῖς ἀνοήτοις γίγνεται → undeserved success engenders folly in unbalanced minds
English (LSJ)
A fight on horseback, Th.4.124, X.Cyr.6.4.18; ἱ. πρὸς ὁπλίτας to fight, cavalry against infantry, Id.Ages.2.3.