General-in-Chief at the outbreak of the war was the elderly Winfield Scott, who would clearly have to retire before long.
Although too old for any kind of active role, he was one of the few officers on either side who realized that it would be a long war, and his original plan - derided for its slowness - was more-or-less than plan that the Union eventually followed.
Commander of Union troops in the first pitched battle was the unfortunate Irvin McDowell, who knew his army was not ready for combat, but was pushed into it by politicians and press, hungry for action.
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.
The job of commander of the Union Forces was offered to Robert Edward Lee.
Robert Anderson was the commander at Ft. Sumter .
U.S. Grant
General George Meade was the commander of the Union forces at Gettysburg.
That depends on which Union forces. U.S. Grant was overall commander of Union forces.
U.S. Grant
Ulysses S.Grant
John Pope
As President, he was Commander-in-Chief of all Union Armed Forces.
George Brinton McClellan
Ulysses S, Grant
ulysses s grant