On This Day In 1863
The largest military conflict in North American history begins this day when Union and Confederate forces collide at Gettysburg, Pennsylvania. The epic battle lasted three days and resulted in a retreat to Virginia by Robert E. Lee’s Army of Northern Virginia.
Two months prior to Gettysburg, Lee had dealt a stunning defeat to the Army of the Potomac at Chancellorsville, Virginia. He then made plans for a Northern invasion in order to relieve pressure on war-weary Virginia and to seize the initiative from the Yankees. His army, numbering about 80,000, began moving on June 3. The Army of the Potomac, commanded by Joseph Hooker and numbering just under 100,000, began moving shortly thereafter, staying between Lee and Washington, D.C. But on June 28, frustrated by the Lincoln administration’s restrictions on his autonomy as commander, Hooker resigned and was replaced by George G. Meade.