Rubuta ci gaba don wannan sakin layi - Lokacin da labarin yakin basasa ya isa Minnesota, Bloomer da 'yan uwansa sun shiga cikin Stillwater Guards, ƙungiyar' yan bindiga ta gida. An tattara masu gadi a cikin Rundunar Sojojin Sojoji na Minnesota na farko a Fort Snelling a ranar 29 ga Afrilu, 1861, wanda ya zama ainihin kamfanin B. An ba Bloomer matsayi na farko kuma ya shiga cikin manyan ayyukan rundunar har zuwa yakin Antietam. Ya ji rauni a kai a yakin Bull Run. A lokacin yakin Savage Station
a ranar 29 ga Yuni, 1862, wanda ya kasance wani ɓangare na Kamfen na Peninsula, an inganta Bloomer zuwa launi mai launi. A tsakiyar yakin an kashe mai dauke da tutar. Bloomer ya karbi launuka, kuma an raba shi daga rundunar na tsawon sa'o'i biyar. Ya mayar da launuka ga rundunar kuma an inganta shi don ƙarfin hali.