Jackson, who was pro-Confederate, was disappointed with the outcome. He called up the state militia to their districts for annual training. Jackson had designs on the St. Louis Arsenal, and had been in secret correspondence with Confederate President Jefferson Davis to obtain artillery for the militia in St. Louis. Aware of these developments, Union Captain Nathaniel Lyon struck first, encircling the camp, and forcing the state militia to surrender. While his troops were marching the prisoners to the arsenal, a deadly riot erupted (the Camp Jackson Affair). This caused greater Confederate support in the state. The already pro-Southern legislature passed the governor's military bill creating the Missouri State Guard. Governor Jackson appointed Sterling Price, who had been president of the convention, as major general of this reformed militia. Price, and Union district commander Harney, came to an agreement known as the Price–Harney Truce, which calmed tensions in the state for several weeks. After Harney was removed, and Lyon placed in charge, a meeting was held in St. Louis at the Planters' House among Lyon, his political ally Francis P. Blair, Jr., Price, and Jackson. The negotiations went nowhere. After a few fruitless hours, Lyon declared, "this means war!" Price and Jackson rapidly departed for the capital. 