Question:  Great Conewago Presbyterian Church used as a Confederate Army hospital during a military invasion of Pennsylvania by the main Confederate army under who?
Sentence (from "Gettysburg Campaign"): After his victory in the Battle of Chancellorsville, Lee's Army of Northern Virginia moved north for a massive raid designed to obtain desperately needed supplies, to undermine civilian morale in the North, and to encourage anti-war elements.
Relevant evidence: No