States the historian of the 57th Pennsylvania after the Peninsula:
The regiment, upon its arrival at Harrison's Landing, presented a most pitiable spectacle. But three months before it numbered almost nine hundred; now but little over half a hundred [approx. 56] responded for duty at first roll-call, and there was not a field officer present. Says Surgeon Lyman: "All were exhausted and disheartened, scarcely a well man in the regiment, with two hundred and thirty, for the first few days, on the sick list." For a time Captain Ralph Maxwell was in command of the regiment, but was succeeded later by Captain Strohecker. Funerals were of such frequent occurrence that the solemn notes of the dead march were almost continually to be heard, until, for the benefit of the living, burials with military honors were suppressed by general order. To the great annoyance of brigade commanders they could muster no more men for brigade drill than would compose an ordinary battalion; the regiments presenting no better appearance as to numbers than a company, and a company than a corporal's guard...
A great-granduncle of mine was one of those discharged owing to chronic illness during this period. At Yorktown, "the regiment camped in a muddy swamp while engaged in hard labor in the trenches. Many men fell sick of malaria, dozens died, and hundreds became unfit for service, many permanently." At Williamsburg, "the regiment dropped packs and greatcoats and advanced at the double quick to join the fighting, but arrived after it had ceased. They then spent the night in a pouring rain with no food, fires or blankets." Lt. Col. George Perkins later commented that: "It seemed as though the regiment had been struck with a pestilence. Nearly, or quite one-half of the men were taken sick, and the number of discharges, from that night's exposure, was greater, I think, than our casualties in any battle during the war..."