The fair girl who was playing a banjo and singing to the wounded soldiers suddenly stopped, and, turning to the surgeon, whispered:"What's that?""It sounds like a mob-"With a common impulse they moved to the open window of the hospital and listened.On the soft spring air came the roar of excited thousands sweeping down the avenue from the Capitol toward the White House. Above all rang the cries of struggling newsboys screaming an "Extra." One of them...