Mezue nkebi ahịrịokwu a: Sneden hapụrụ Brooklyn n'afọ 1861 iji sonye n'Òtù Ndị Agha Ụgbọ Mmiri nke New York nke 40, ma ọ bụ "Òtù Ndị Agha Ụgbọ Mmiri nke Mozart", nke ndị agha Potomac. O jere ozi dị ka onye na-elekọta ụlọ mgbe ndị agha ya mara ụlọikwuu na nso Leesburg Turnpike. Malite na Jenụwarị 12, 1862, Sneden jere ozi na ndị ọrụ nke Samuel P. Heintzelman nke III Corps, na mbụ, dị ka onye na-ese ihe na ọrụ map, emesịa, dị ka injinia topographical. Na Machị 22, 1862, Sneden so Heintzelman banye n'agha Peninsula, na-esonye n'agha nke Williamsburg, agha nke Seven Pines,
Agha nke Savage's Station, na Agha nke Glendale. Mgbe ọ laghachiri Northern Virginia, o sonyere na Agha nke Abụọ nke Bull Run. E kenyere ya ọrụ ichebe Washington, D.C., nke mbụ na Alexandria, Virginia, mgbe ahụ na Arlington House.