General Order No. 11 (1863)

General Order No. 11 is the title of a Union Army directive issued during the American Civil War on August 25, 1863, forcing the evacuation of rural areas in four counties in western Missouri. The order, issued by Union General Thomas Ewing, Jr., affected all rural residents regardless of their allegiance. Those who could prove their loyalty to the Union were permitted to stay in the affected area, but had to leave their farms and move to communities near military outposts (see villagization). Those who could not do so had to vacate the area altogether.

While intended to deprive pro-Confederate guerrillas of material support from the rural countryside, the severity of the Order's provisions and the nature of its enforcement alienated vast numbers of civilians, and ultimately led to conditions in which guerrillas were given greater support and access to supplies than before. It was repealed in January 1864, as a new general took command of Union forces in the region.

More than 140 years later, towns impacted by General Order No. 11 are still less developed than their neighbors.

Order No. 11 was issued four days after the August 21 Lawrence Massacre, a retaliatory killing of men and boys led by Confederate bushwhacker leader William Quantrill. The Union Army believed Quantrill's guerrillas drew their support from the rural population of four Missouri counties on the Kansas border, south of the Missouri River. These were: Bates, Cass, Jackson, and part of Vernon. Following the slaughter in Lawrence, Federal forces were determined to end such raiding and insurgency by any means necessary—no matter what the cost might be to innocent civilians. Hence, General Thomas Ewing, who had lost several lifelong friends in the raid, issued Order No. 11. Ewing's decree ordered the expulsion of all residents from these counties except for those living within one mile of the town limits of Independence, Hickman Mills, Pleasant Hill, and Harrisonville. The area of Kansas City, Missouri north of Brush Creek and west of the Blue River, referred to as "Big Blue" in the order, was also spared.

...
Wikipedia