As I understand it the Battle of Gettysburg was an accidental battle, the plan was for the Army of Northern Virginia to move north to Harrisburg, PA then to Philadelphia and finally to move south to threaten Washington D.C..
The Army of Northern Virginia had stopped in Gettysburg to replenish their boots when units of the Union Army caught up with them and blocked their movement out of the area.
So what if the Army of Northern Virginia was able to continue their march north unimpeded?
The main goal was to panic the North and shift the Union Army from the Vicksburg area of operations to the Potomac to cover Washington D.C.
The Army of Northern Virginia had stopped in Gettysburg to replenish their boots when units of the Union Army caught up with them and blocked their movement out of the area.
So what if the Army of Northern Virginia was able to continue their march north unimpeded?
The main goal was to panic the North and shift the Union Army from the Vicksburg area of operations to the Potomac to cover Washington D.C.