Someone who commanded the major armies during the Civil War
Ulysses grant
There were several generals during the Civil War who were leaders of confederate troops, but probably you are thinking of Robert E. Lee, who commanded the Confederate Army of Northern Virginia.
Grant commanded the Northern army during the US Civil War. Giap commanded the Northern army during the Vietnam War.
Sherman commanded the Union troops that captured Atlanta in September 1864.
George Washington was in charge of all of the troops; if you mean the Civil War, Robert. E. Lee commanded the Confederates, or the South.
The Commanding General of the Union Army was Ulysses S. Grant
The last Commanding General of the Union Army was Ulysses S. Grant
The Commander In Chief of the Union army during the Civil War was President Abraham Lincoln; the ranking general in the field was Ulysses S. Grant.
The Army of Northern Virginia was commanded by Robert E. Lee
The overall commander of the Confederate States of America during most of the Civil War was General Robert E. Lee.
Ultimately, per the US Constitution, Abraham Lincoln as the Commander In Chief of the US armed forces; but for most of the Civil War, the field commander was General US Grant