Robert E. Lee was the Head General of the Confederate Army. First, President Lincoln want Lee to be a Commander of the Union Army. But, Lee had sided with his home state and taken the offer of General of the Confederate Army. He soon emerged as a shrewd tactician and battlefield commander, winning numerous battles against larger Union armies. But took heavy casualties at the Battle of Gettysburg, and was defeated. A heavy lost for the Rebel Army. Lee surrendered to General Ulysses S. Grant at Appomattox Court House, ending the war.
I think you mean Robert E. Lee. He was one of two generals of the confederacy, the other being "stone wall" Jackson. He was the only one to live to the end, because Jackson was shot by his own man. He was short and had problems with falling asleep at random times.