This Crispus coin from Siscia has a shield decorated with a horseman [leaping over fallen enemy].
Crispus
A.D. 320
IVL CRISPVS NOB CAES; Laureate, cuirassed, spear pointing forward, shield with horseman on left arm.
VIRTVS EXERCIT; Standard inscribed VOT/X with captive seated on ground on either side, in left field S, in right field F over HL.
in ex. [A]SIS ✶
RIC VII Siscia 123