After the battle, Jackson, assuming he still had his powers as governor, called together a rump legislature at Neosho, Missouri. He called for session on October 28, 1861 and, although deposed, officially claimed Missouri to have joined the Confederacy in November 1861. He was given the rank of Brigadier general in the Confederate Army. But he soon resigned due to failing health. On December 6, 1862, Jackson died in Little Rock, Arkansas from stomach cancer. He is buried at Arrow Rock, Missouri in the Sappington family cemetery.