McClellan being now in full retreat and considering only those problems which related to escape, abandoned the position at Fair Oaks and posted Sumner and Heintzelman at Savage's Station. Their sole function was to guard the flank of the hurriedly retreating Federal army. To that end they were ordered to defend the position at Savage's Station until nightfall, or, in other words, until McClellan's retreating army should have passed that point in its hurried flight. Here the Confederates under Magruder attacked with fury and the Federal general Heintzelman was driven into retreat. But Sumner heroically held his ground until nightfall, thus accomplishing McClellan's purpose, though at cost of a fearful loss in killed and wounded. He was so hard pressed indeed that when he retired at nightfall, he was forced to leave all his wounded in the enemy's hands and make a precipitate retreat to avoid the capture of his entire force. Fortunately his enemy was a civilized one, so that his wounded men, left in their hands, were as tenderly cared for as if Federal surgeons had had them in charge. The only difference was that Federal surgeons had all possible medicaments and surgical appliances, while the Confederates, by reason of the blockade, lacked many life-saving agents, particularly the quinine which men wounded after long campaigning in the Chickahominy and White Oak swamps needed as imperatively as a shipwrecked crew needs life-lines and breeches-buoys. The war was so far civilized that the surgeons on either side eagerly did their best for such of the enemy's wounded as might fall into their hands. But it was still so far savage,--and it remained so to the end--that the side which possessed a navy shut out from the other as contraband of war the medicines necessary to the saving of human life and the rescue of the wounded from a needless death, as resolutely as it shut out gunpowder itself. In other words, the blockade was to this extent a part of that savagery which makes war upon the sick and wounded and other non-combatants as determinedly as it does upon stalwart men with guns in their hands and cartridge boxes strapped around their waists. There is cruelly no room for doubt that during the Seven Days' battles thousands of gallant fellows on both sides were buried in the fetid mud of those swamps, who might have been saved, had the world then been civilized enough for the Federals to let the Confederates have the quinine, the calomel and the opium they needed for the salvation of the lives of those who could fight no more, whether Federal or Confederate in their allegiance.