戎馬 is read as じゅうば (juuba) and means warhorse.
じゅうば
juuba
けいば
horse racing
うま
horse
はくば
unrefined sake
ひんば
mare
えま
votive tablet
たけうま
hobby horse
しゅつば
going in person
じょうば
horse riding
さんかんば
winner of Japan's three main horse races
きょうそうば
racehorse
きば
げば
dismounting