And individual units did surrender at other times during the rebellion as well. But it was the south who raised tossing in the towel to a high art, surrendering whole armies at Vicksburg and Donalson and Appomattox and North Carolina...
Sure..that is true. But our Confederate Armies were starving, suffering with no medicines, lacking in men,arms, etc. and we STILL held off the Union Army till 1865, who had overwhelming supplies of all the same. Yes, we surrendered, but we weren't whipped. Big difference.