A fresh examination of the unique strategies and technological achievements made by General Longstreet during the Civil War. Lieutenant-General James Longstreet, commander of the First Corps of the Army of Northern Virginia, was a brilliant tactician and strategist. Prior to the Civil War there were many technological developments, of which the rifled musket and cannon, rail transport and the telegraph were a few. In addition, the North enjoyed a great advantage in manpower and resources. Longstreet adapted to these technological changes and the disparity between the belligerents making recommendations on how the war should be fought. Longstreet made a leap of thinking to adjust to this new type of warfare. Many others did not make this leap, including Robert E. Lee, “Stonewall” Jackson, Bragg, Hood and Jefferson Davis. Unfortunately, his advice was not heeded and given the weight it deserved. In contrast to many other southern generals, Longstreet advocated for defensive warfare, using entrenchments and trying to maneuver the enemy to assault his position, conserving manpower, resources and supplies. With the advent of the highly accurate and long-range rifled musket, offensive tactics became questionable and risky. This caused Longstreet to come into conflict with General Robert E. Lee at Gettysburg. Longstreet opposed the Gettysburg campaign and Lee’s battle plans at Gettysburg against General Meade and the Army of the Potomac.