Who were the head generals leading the armies of the North and South?

During the American Civil War, the primary general for the Union (the North) was Ulysses S. Grant, who played a crucial role in leading Union forces to victory. On the Confederate side (the South), Robert E. Lee served as the head general, commanding the Army of Northern Virginia and becoming a prominent figure in the South's military efforts. Their leadership styles and strategies significantly influenced the course of the war.