Rubuta ci gaba ga wannan sakin layi - Ya shiga rundunar Sojojin Tarayyar a matsayin mai zaman kansa a Kamfanin E na 49th New York Volunteer Infantry a watan Yuni, 1861, ya tashi zuwa sandan da aka tsara. Tare da Sojojin Potomac, ƙungiyarsa ta shiga cikin yaƙe-yaƙe waɗanda suka haɗa da Young's Mill, Yorktown, Williamsburg, Mechanicsville, Fair Oaks, Gaines's Mill, Savage's Station
, Malvern Hill, Bull Run na biyu, Dutsen Kudu, Antietam, Fredericksburg, Williamsport, Gettysburg, Gudun Ruwa, Daji, Cold Harbor, Petersburg da sauransu. An kama Walsh ne a lokacin ayyukan da aka yi a kan Railroad na Welden ba da daɗewa ba kafin ƙarshen lokacin da ya yi rajista kuma ya kasance fursuna a Belle Isle, Libby Prison, Andersonville, Savannah, Castle Pinckney da Florence Stockade, kafin a musayar shi kuma ya koma Annapolis, Indiana, inda aka sallame shi a ranar 5 ga Mayu, 1865. A wani lokaci bayan wannan, ya shafe shekaru takwas yana aiki a " Wisconsin State Journal " a Madison.