That depends on which Union forces. U.S. Grant was overall commander of Union forces.
George Brinton McClellan
As army commander, U.S. Grant. He was reporting to the Union General-in-Chief, Henry Halleck.
General Ambrose Burnside was a commander of Union forces in the East during 1861 and 1862, but General William Tecumseh Sherman was not. While Sherman played a significant role in the Western Theater during this period, he did not command Union forces in the Eastern Theater until later in the war. Other notable commanders of the Eastern forces during 1861-1862 included George McClellan and John Pope.
Robert Anderson was the commanding officer for the Union during the Battle of Fort Sumter, and P. G. T. Beauregard was the Confederate commander. The battle resulted in a victory for the Confederacy.
robert e lee
The Union had undergone a number of successive commanders , in 1865 the Union commander was U.S.Grant and for the Confederacy it was Robert E. Lee .
The job of commander of the Union Forces was offered to Robert Edward Lee.
Robert Anderson was the commander at Ft. Sumter .
Richmond, Virginia was the capital of the Confederate States of America. Richmond was captured by the Union forces on April 2, 1865.
U.S. Grant
General George Meade was the commander of the Union forces at Gettysburg.
April 14, 1865
U.S. Grant
He was the commander of the Northern Army of Virginia. In 1865 he became Supreme Commander of all Confederate forces.
Lincoln served as President during the Civil War. in 1864, he appointed Grant as the overall commander of Union forces. Grant accepted Lee's surrender in 1865.
Ulysses S.Grant
John Pope