The Confederate "Battle Flag" numbering 12 and 13 stars for Missouri and Kentucky.
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 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.