The Confederate "Battle Flag" numbering 12 and 13 stars for Missouri and Kentucky.
Meeting in Neosho, Missouri, Governor Jackson and other leading Missouri secessionists, acting as the Missouri General Assembly, enacted an ordinance of secession on October 28, 1861; however, the legal status of this ordinance was not accepted by Missouri's Union supporters, then or later. The secession government applied for and, on November 28, 1861, was granted admission to the Confederate States of America as the purported 12th state of the Confederacy. As a result of military operations, however, particularly the Battle of Pea Ridge in March 1862, the Confederate government of Missouri was not able to establish control over much of the state; its jurisdiction extended only as far as Confederate military strength could extend. Governor Jackson and his government were forced into exile. The exiled government established operations in Marshall, Texas, as part of the Trans-Mississippi bloc of Southern civil governments.
Although Confederate supporters in Missouri were unable to make their secession good, the Southern government-in-exile sent legislators to the Congress of the Confederate States, and Missouri was represented by the twelfth star on the Confederate battle flag.