Whakaotihia te rerenga e whai ake nei: I uru a Carl ki te Kamupene F o te 4th Wisconsin Infantry Regiment (National Guard) i te Paenga-whāwhā o te tau 1896 a i tono ia mo te mahi i te Pakanga Paniora-Amerika i te tau 1898. I mahi a Brosius i roto i te Kamupene M o te 1st Wisconsin Infantry Regiment i te Pakanga, a, i tukuna ia i te marama o Akuhata 1900. I te Hōngongoi 1913, i whakauruhia ia ki te Kamupene D o te 1st Wisconsin Infantry Regiment; i whakawhitihia ia ki te Kamupene F i te Paenga-whawha 1915 a i whakatairangahia ia ki te Tuarua Tuarua i nga marama e rua i muri mai. I whakauruhia a Brosius ki te mahi mo te
Te Pakanga Taitapa o Mexico i te Pipiri 1916, i reira ia i whakahau ai i tetahi ope hoia. I te mea kua whai ingoa nui ia hei kaiwhakaako tinana, i noho tonu a Brosius ki te United States i te Pakanga Tuatahi o te Ao, ka haere mai i te puni ki te puni ki te whakatinana i nga kaupapa whakangungu mo nga hoia Amerika.