that was George b.McClellan
no one
The general in chief of all Union armies at the end of the war was Ulysses S. Grant.
The Commanding General of the Union Army (for most of the Civil War) was General Ulysses S. Grant; the Commanding General of the Confederate Army was Robert E. Lee
Richard MontgomeryRobert E. Lee was the commanding general for the Confederacy and Ulysses S. Grant was the commanding general for the Union.
The General-in-Chief of the Union Armies was Ulysses S. Grant, and General-in-Chief of the Confederate armies was Robert E. Lee. Technically, the commander of the victorious Army of the Potomac was General George Meade, but Grant was travelling in a mobile HQ right beside him, and took Lee's surrender.
Lincolon
William Tecumseh Sherman was an Union commanding general in the Civil war.
Someone who commanded the major armies during the Civil War
The Commanding General of the Union Army was Ulysses S. Grant
Commanding General Ulysses S. Grant
Ullyses S. Grant was the general of the Northern armies (Union) who went on to become president
The last Commanding General of the Union Army was Ulysses S. Grant