The concepts of interior and exterior lines gained prominence during the Napoleonic Era with the writings of Jomni. Interior Lines of Operation deal with forces whose operations diverge from a central point. The use of interior lines allows a commander to rapidly shift forces to the decisive point. The battle of Gettysburg was a great historical example illustrating the impact of interiorand exterior lines. Throughout the three days of battle, General Meade applied Operational Art in positioning his forces at the decisive time and place. One must keep in mind the significance of General Meade's actions at Gettysburg. He defeated the venerable General Robert E. Lee on the battlefield, a feat elusive to all previous commanders of the Army of the Potomac. This featwas made possible by the ability to decisively shape the battlefield using interior lines.