Lee's greatest victories were the Seven Days Battles, the Second Battle of Bull Run, the Battle of Fredericksburg and the Battle of Chancellorsville, but both of his campaigns to invade the North ended in failure. Barely escaping defeat at the Battle of Antietam in 1862, Lee was forced to return to the South. In early July 1863, Lee was decisively defeated at the Battle of Gettysburg in Pennsylvania. However, due to ineffectual pursuit by the commander of Union forces, Major General George Meade, Lee escaped again to Virginia.