Ramba uchiverenga ndima iyi - Carl akanyoresa muCompany F ye4th Wisconsin Infantry Regiment (National Guard) muna April 1896 uye akazvipira kushanda muHondo yeSpain neAmerica muna 1898. Brosius akashanda muCompany M ye1st Wisconsin Infantry Regiment munguva yeHondo, uye akaburitswa zvine rukudzo muna Nyamavhuvhu 1900. Muna Chikunguru 1913, akanyoreswazve muDhipatimendi D re1st Wisconsin Infantry Regiment; akaendeswa kuDhipatimendi F muna Kubvumbi 1915 uye akasimudzirwa kuva 2nd Lieutenant mwedzi miviri gare gare. Brosius akaiswa mubasa nokuda kweHondo yeMuganhu yeMexico
muna June 1916, kwaaitungamirira chikwata chevarwi. Sezvo akanga awana mukurumbira wakaisvonaka somurovedzi womuviri, Brosius akaramba ari muUnited States mukati meHondo Yenyika I, achienda kubva kumusasa kuenda kumusasa kuti aite zvirongwa zvokurovedza zvevarwi veAmerica.