He called for additional troops.
Port Hudson, Mississippi
Distracting the attention of the garrison commander by ordering a cavalry raid right down through the state of Mississippi, while Grant managed to get his men across to the East bank of the river, unnoticed.
Congressional Democrats
That was Robert E. Lee.
Like many senior Virginians, he opposed secession.
Whether he opposed slavery is more doubtful. He had had to take two years' leave to sort out his father-in-law's estate, which included many slaves. The old man had unwisely told them that they would be freed on his death. But they could not be freed until the disposal of the estate had been completed, and they became very rebellious.
Lee decided to make an example of the ringleaders, and his treatment of them was quite brutal, though not abnormal by the standards of the time.
His beliefs about slavery seem to be equivocal, and he has been claimed as a figurehead by both sides of the debate.
Vicksburg had many geographical advantages.
That African Americans be accepted into the Union military
Allowed African-Americans to participate as war laborers and soldiers
the deaths of nearly 25,000 Union and Confederate troops at the Battle of Shiloh in Tennessee.
His colleagues said that this would make it look like a desperate gesture - trying to assert a moral war-mission to take people's minds off defeat. He ought to wait for a Unon victory, in order to carry conviction.
In addition and of great importance was that they did not want Lincoln's emancipation to cause problems in the "Border States" where slavery existed and were not included in the final emancipation issued on January 1, 1863.