Rubuta ci gaba ga wannan sakin layi - Wilshire ya shiga rundunar sojojin Union a matsayin babban jami'in a cikin Daruruwan da ashirin da shida, Illinois Volunteer Infantry, kuma ya yi aiki daga Yuli 16, 1862. Bayan Siege na Vicksburg, an aika da rundunarsa zuwa Arkansas da kuma Little Rock Campaign
karkashin jagorancin Manjo Janar Frederick Steele. Ya yi murabus Yuli 16, 1864 saboda dalilai na kiwon lafiya.