Dee ihe ọzọ maka paragraf a - N'oge oyi nke 1861-62, Willson sonyere n'ichekwa okporo ụzọ Baltimore na Ohio na mkpọsa na Virginia n'okpuru ndị ọchịagha Nathaniel Banks na John Pope. Ọ lụrụ ọgụ na Agha Antietam, Septemba 17, 1862. Na Mee 5, 1863, e merụrụ ya ahụ nke ukwuu na Agha nke Chancellorsville Virginia. Ọ laghachighi ọrụ ruo na Septemba 1863 n'okpuru Ọchịagha Joseph Hooker mgbe XI na XII Corps nke ndị agha nke Potomac kwagara n'ebe ọdịda anyanwụ iji wusie ndị agha nke Cumberland ike gburugburu Chattanooga, Tennessee. N'ebe ahụ, Willson sonyere n'agha ndị a lụrụ na Wauhatchie, Lookout Mountain
, Missionary Ridge, Peavine Creek, na Ringgold Gap.