Oh man the Confederate government should complain to the UN and demand an apology from Obama! Oh wait, the Confederate government doesn't exist because they had their asses massacred by their betters. Alas...
Actually more union soldiers were killed than Confederate's, despite the fact that the union had superiority in every facet of the conflict.
Had Lee been the commander of the union forces (like Lincoln originally wanted) the war would have been over much sooner and fewer lives would have been lost.