戎馬 is read as じゅうば (juuba) and means warhorse.
じゅうば
juuba
うま
horse
けいば
horse racing
はくば
unrefined sake
めま
mare
えま
votive tablet
ちくば
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