Dee ihe na-aga n'ihu na paragraf a - MacRae debanyere aha dị ka onye nkịtị na Monroe ọkụ infantry, na a họpụtara onyeisi mgbe ọ ghọrọ Company B, Fifteenth North Carolina infantry regiment. N'April 1862, e buliri ya n'ọkwa lieutenant colonel. N'oge Mgbasa Ozi nke Peninsula na nke abụọ Manassas ndị agha ya bụ akụkụ nke ndị agha Howell Cobb. Na Agha Antietam, MacRae nyere ndị agha ahụ iwu nke belatara ruo ndị ikom 250 n'oge ọgụ ahụ n'izu ole na ole gara aga. MacRae's brigade gbochiri mwakpo atọ nke Union mana ọ laghachiri azụ mgbe o nwere naanị mmadụ iri ise fọdụrụnụ na ngwongwo ya agwụla. Na Fredericksburg, ya na ndị agha ya lụrụ ọgụ na Marye's Heights. Ozugbo agha ahụ gasịrị, a kpọfere ndị agha nke 15 nke North Carolina na Brigadier General John Rogers Cooke's North Carolina brigade. Cooke merụrụ ahụ nke ukwuu na Fredericksburg ma ghara ịlaghachi na brigade ruo Eprel 1863. N'ọnwa Febụwarị nke afọ 1863, e mere MacRae onyeisi ndị agha. Brigade a jere ozi na North Carolina na ndịda ọwụwa anyanwụ Virginia ruo mgbe Gettysburg Campaign gasịrị. na February, 1863, onye isi ala, na 1864 ka a họpụtara brigadier-general. Mgbe MacRae sonyeere ndị agha nke Northern Virginia, a kwanyere ya ugwu maka obi ike ya n'agha nke Bristoe Station. Mgbe Brigadier General William Whedbee Kirkland merụrụ ahụ n'agha nke Cold Harbor MacRae ka akwalitechara ruo nwa oge n'ọkwa nke brigadier general ma nye ya iwu nke brigade Kirkland (nke a bụkwa brigade nke Brigadier General J. Johnston Pettigrew). N'Ụlọ Nche Ream
MacRae, Lane, na Cooke's brigades chụpụrụ John Gibbon's 2nd Division nke Winfield Scott Hancock's II Corps site na ebe ya dị n'ihu ha ma weghara batrị egbe. Mgbe o jesịrị ozi dị mma n'agha nke Boydton Plank Road MacRae nọgidere na ndị agha site na Mgbasa Ozi Appomattox.