In a bold move Lee divided his Army of Northern Virginia into five smaller armies or columns. Three he sent with General "Stonewall" Jackson to attack and hold Harpers Ferry. This way Jackson could control the Shenandoah Valley. He sent his largest corps commanded by Lieutenant General James Longstreet to move towards Sharpsburg, Maryland. Lee wrote Special Order 191 on September 9, which outlined each move by all his columns. In a strange twist of fate, a copy of the order was wrapped around a bundle of cigars and dropped in a field on Best Farm. Union soldiers of the 27th Indiana Regiment found the bundle with the order. It was sent to General McClellan.