, leader of the Copperheads, coined the slogan: "To maintain the Constitution as it is, and to restore the Union as it was." The Copperheads sometimes talked of violent resistance and, in some cases, started to organize. However, they never actually made an organized attack. As war opponents, Copperheads were suspected of disloyalty, and their leaders were sometimes arrested and held for months in military prisons without trial. One famous example was General
Ambrose Burnside's 1863
General Order Number 38, issued in Ohio, which made it an offense (to be tried in military court) to criticize the war in any way. The order was used to arrest Ohio congressman
Clement L. Vallandigham when he criticized the order itself. However, Lincoln commuted his sentence but exiled him to the Confederacy. Probably the largest Copperhead group was the
Knights of the Golden Circle. Formed in Ohio in the 1850s, it became politicized in 1861. It reorganized as the Order of American Knights in 1863 and again in early 1864 as the Order of the Sons of Liberty, with Vallandigham as its commander. One leader,
Harrison H. Dodd, advocated the violent overthrow of the governments of Indiana, Illinois, Kentucky, Tennessee, and Missouri in 1864. Democratic Party leaders and a Federal investigation thwarted his "
Northwest Conspiracy". Despite this Copperhead setback, tensions remained high. These tensions would contribute to physical altercations between Copperheads, Republicans, and Union soldiers in Illinois towns such as
Paris,
Mattoon, and ultimately in
Charleston. The
Charleston Riot would take place in Charleston on March 28th, 1864 and would end with six Union soldiers and two Copperheads dead. This event would draw the attention of President Lincoln, and would become national news. Indiana Republicans then used the sensational revelation of an antiwar Copperhead conspiracy by elements of the Sons of Liberty to discredit Democrats in the
1864 House elections. The military trial of
Lambdin P. Milligan and other Sons of Liberty revealed plans to set free the Confederate prisoners held in the state. The culprits were sentenced to hang, but the
Supreme Court intervened in
Ex parte Milligan, saying they should have received civilian trials. Most Copperheads actively participated in politics. On May 1, 1863, former Congressman Vallandigham declared that the war was being fought not to save the Union but to free the blacks and enslave Southern whites. The U.S. Army then arrested him for declaring sympathy for the enemy. He was court-martialed by the Army and sentenced to imprisonment, but Lincoln
commuted the sentence to banishment behind Confederate lines. The Democrats nevertheless nominated him for governor of Ohio in 1863. He left the Confederacy and went to Canada, where he campaigned for governor but lost after an intense battle. He operated behind the scenes at the
1864 Democratic convention in Chicago. This convention adopted a largely Copperhead platform and selected Ohio Representative
George Pendleton, a Peace Democrat, as the vice-presidential candidate. However, it chose a pro-war presidential candidate, General
George B. McClellan. The contradiction severely weakened the party's chances to defeat Lincoln. == Characteristics ==