Kammala jumla mai zuwa: Bayan farkon yakin basasa, an nada Gamble a matsayin Laftanar Colonel na 8th Illinois Cavalry regiment a ranar 18 ga Satumba, 1861. Abokinsa na kusa, John F. Farnsworth, wanda ya tayar da kuma umurci rundunar, ya bukaci a zabi shi. Ɗan Gamble George ya shiga cikin rundunar a matsayin mai mulki na farko. (George tsira da yaki, amma aka kashe a cikin wani faduwa hotel a lokacin
1906 San Francisco girgizar kasa).