caballo de batalla
USO DE LOS CABALLOS EN LOS CONFLICTOS BÉLICOS
El caballo en la guerra; Caballo de guerra; Caballos de guerra; Caballos de batalla; Caballo de batalla; Rol del caballo en las guerras; Rol del caballo en la guerra; Caballos en la guerra
(n.) = uphill struggle, hobby-horse, war horse
Ex: While I have received rave reviews for these courses I teach, I have an uphill struggle to fill them. Ex: They then lambasted her for interrupting the president and riding her hobby-horse of war and peace. Ex: The destrier is the most well-known war horse of the medieval era carrying carried knights in battles, tournaments, and jousts.