Isku day inaad sii wadato faqradan - Sneden wuxuu ka tagay Brooklyn sanadkii 1861 si uu ugu biiro New York Volunteer Infantry Regiment, ama "Mozart Regiment", ee Ciidanka Potomac. Waxa uu ahaa sarkaal xigeen markii guurtidiisu ay ku xeraysnayd meel u dhow Leesburg Turnpike. Laga bilaabo Janaayo 12, 1862, Sneden wuxuu ka shaqeeyay Samuel P. Heintzelman's III Corps shaqaalaha, marka hore, sida sawir qaade ka shaqeeya khariidadaha, markii dambe, injineer topographic ah. Bishii Maarso 22, 1862, Sneden wuxuu la galay Heintzelman Ololaha Jasiiradda, isagoo ka qeyb qaatay Dagaalkii Williamsburg, Dagaalkii Toddoba Pines, Dagaalkii Saldhigga Savage
, iyo Dagaalkii Glendale. Markii uu ku soo laabtay Waqooyiga Virginia, wuxuu ka qeyb qaatay Dagaalkii Labaad ee Bull Run. Waxaa loo xilsaaray difaaca Washington, D.C., marka hore Alexandria, Virginia, ka dibna Arlington House.