That would be the Gen. Lee Lincoln wanted to command the Union!!
One of the more significant turns in Western history, beyond it being a "modern" war, was that fighting for and with honor was replaced in the starkest of ways with fighting to kill. The gentility of former wars was forcefully replaced with "total war". It was no longer about dying for your country, but was instead (in the words of George S. Patton) about,"making the other miserable ba***rd die for his." The First Families, though bravely and gallantly fighting, were worn down by an indomitable machine called the common man. On both sides the prime lesson was learned, that every free man is a king and fights with a king's heart.