Dee ihe na-aga n'ihu na paragraf a - Grant zụrụ ndị agha Union ma bulie ya n'ọkwa Colonel na June 1861. Maj. Gen. John C. Frémont, onye lere Grant anya dị ka "ọchịchọ ígwè" iji merie, họpụtara Grant ka ọ bụrụ ọchịagha nke District nke Cairo. Grant ghọrọ onye ama ama na mba ahụ niile mgbe ọ nwetasịrị Fort Donelson na February 1862 ma onye isi ala Abraham Lincoln kwalitere ya ịbụ Major General. Mgbe ọtụtụ agha na mmeri ndị dị oké ọnụ ahịa a lụrụ na Shaịlo gasịrị
, Vicksburg, na Chattanooga, Onye isi ala Lincoln buliri Grant n'ọkwa Lieutenant General na 1864 ma nye ya ọrụ nke ndị agha Union niile. Grant gara n'ihu merie Robert E. Lee mgbe usoro ọzọ nke agha dị oke ọnụ na Overland Campaign, Petersburg, na Appomattox. Mgbe Agha Obodo ahụ gasịrị, e nyere Grant nkwalite ikpeazụ ya nke General nke ndị agha na 1866 wee jee ozi ruo 1869. N'ihi na Grant bụ onye ama ama n'agha ndị Union, a họpụtara ya ugboro abụọ dịka onye isi ala nke iri na asatọ nke United States.