What event happened before general Lee moved his forces out of the Pennsylvania in 1863?

Before General Robert E. Lee moved his forces out of Pennsylvania in 1863, the significant event was the Battle of Gettysburg, which took place from July 1 to July 3. This battle marked a turning point in the American Civil War, as Lee's Army of Northern Virginia faced Union forces led by General George Meade. After suffering heavy casualties and being forced to retreat, Lee ultimately withdrew his troops back to Virginia. The defeat at Gettysburg significantly weakened the Confederate Army's offensive capabilities in the North.