Spots 
Regiments like the Seventy-Seventh New York assemble in response to the federal call for troops, gathering at Saratoga before moving south. Arrival in Washington reveals a city transformed into a vast military encampment surrounded by earthworks. Initial duties involve drill, encampment routine, and adapting to army medical and quartermaster logistics.
Campaigning through Virginia swamps around Yorktown and Williamsburg introduces typhoid and malaria long before heavy artillery fire begins. Medical personnel set up field hospitals in ruined barns and wooden churches to treat wounded soldiers during McClellan's advance. Transporting injured men along muddy roads tests the endurance of hospital corps staff.
Major General William B. Franklin leads the Sixth Corps assault up South Mountain, carrying the pass at Crampton's Gap at bayonet point. Arriving at Sharpsburg during the bloody engagement along Antietam Creek, the corps acts as a strategic reserve to hold the Union line. Field surgeons manage hundreds of gunshot wounds in makeshift farmyard operating sites.
Major General John Sedgwick directs the Sixth Corps to assault the formidable Confederate fortifications behind Fredericksburg during the Chancellorsville campaign. Disregarding heavy artillery fire, the troops carry the stone wall and heights before advancing toward Salem Church. Tending to casualties under continuous rifle fire tests the courage of hospital staff serving near the front.
Dispatched to the Shenandoah Valley under Philip Sheridan, the Sixth Corps helps turn early surprise into decisive victory at Cedar Creek. Medical personnel manage wounded from intense fighting across farm fields and creek crossings. The defeat of Jubal Early's forces permanently closes the Valley as a Confederate supply corridor and avenue of invasion.
A surgeon records the Union Sixth Corps from its formation through major Army of the Potomac campaigns.