Answer:
He thought it would give some of the Southern cities time to recover
Step-by-step explanation:
General Robert E. Lee was the general commanding the southern forces during the American civil war. following the defeat of the Northern forces in Virginia he decided to march up North to engage the Northern forces in Gettysburg.
He also intended to resupply his men outside the Northern Virginia where he had defeated Northern forces. he also saw this move up north as a way of relieving the war torn cities and giving them time to recover because most of the battles have been fought in the southern cities.