At the battle of Gettysburg,? the Confederate army, desperate from a lack of supplies due to the Anaconda Plan stifling trade, attempted to invade Pennsylvania for both supplies and to put the North on the Defensive. O While it was a very hard three-day battle, the U.S. eventually won, forcing the Confederate Army to retreat and slowly lose ground the rest of the war. the Confederate Army unwisely destroyed a Harley-Davidson store near the town, which caused an even stronger U.S. war effort against the South. General Grant (US Army) occupied the town first and ended all chances for the Confederates to use the rail- road there for a quick invasion of the North.