Rubuta ci gaba don wannan sakin layi - An haifi Seamonson kusa da Skien, Norway, a ranar 9 ga Fabrairu, 1840 kuma ya yi hijira zuwa Amurka a matsayin yaro a 1842. Iyalin sun fara zama a Muskegon, Michigan sannan suka koma Pleasant Springs, Wisconsin a 1844. A lokacin yakin basasa na Amurka, ya yi aiki tare da 23rd Wisconsin Volunteer Infantry Regiment na Union Army, inda ya sami mukamin sajan. Rikicin da ya shiga ya hada da yakin Chickasaw Bayou, yakin Arkansas Post, yakin Grand Gulf
, Yaƙin Champion Hill, Siege na Vicksburg, Jackson Expedition, Yaƙin Bayou Bourbeux, Yaƙin Mansfield, Yaƙin Pleasant Hill, Yaƙin Spanish Fort da Yaƙin Fort Blakely. Bayan haka, Seamonson ya mallaki gonaki a Pleasant Springs.