τους φίλους λόγων τέχναιν επαίδευσας → Using 2 artifices, you educated (taught) those who love rhetoric.
pelta: ae, f., = πέλτη,
I a small, light shield in the shape of a half-moon, originally used by the Thracians and other barbarous people, Liv. 28, 5, 11; Verg. A. 1, 490; 7, 743; Ov. P. 3, 1, 96; Sil. 2, 80; Plin. 12, 5, 11, § 23; Sen. Hip. 402; Vulg. 2 Par. 23, 9.