Ia tusia se faaauauga mo lenei palakalafa - Na tuua e Sneden Brooklyn i le 1861 ina ia auai i le 40th New York Volunteer Infantry Regiment, po o le "Mozart Regiment", o le Army of the Potomac. Na avea o ia ma pule o le vaega a o tolauapi lana vaega i le auala televave i Leesburg. E amata mai i le aso 12 Ianuari, 1862, na galue ai Sneden i le vaega a Samuel P. Heintzelman's III Corps, i le taimi muamua, o se tagata tusi ata i luga o galuega faafanua, mulimuli ane, o se inisinia topographic. I le aso 22 o Mati, 1862, na amata ai le faigamalaga a Sneden ma Heintzelman mo le Peninsula Campaign, ma auai ai i le Taua i Williamsburg, Taua i Seven Pines, Taua i Savage's Station
, ma le Taua i Glendale. Ina ua toe foʻi i Northern Virginia, na auai o ia i le Taua Lona Lua i Bull Run. Na tofia o ia e puipuia Uosigitone, D.C., muamua i Alexandria, Virginia, ona tofia lea o ia i Arlington House.