to have arms and artillery given to pro-Confederate forces in the Missouri State Militia. Ordering the State Militia to begin mobilizing on May 1st, an encampment was established outside of St. Louis called Camp Jackson. While the Governor claimed that this was only a training exercise, on May 9th, the Confederate equipment was delivered to the camp to help them take the Arsenal by force. This action set the stage for Lyon's arrest of a Missouri State Militia encampment on May 10 after discovering the Confederate artillery. This event, known as the Camp Jackson affair sparked a pro-secession riot when the State Militia were marched through town to be held in the Arsenal. The violence that ensued allowed Governor Jackson to force through a bill that gave him near dictatorial powers, and ordered a new Missouri State Guard under command of Sterling Price. Price had been the President of the now-adjourned Missouri Constitutional Convention, and had previously resisted Jackson's call for secession. After the Camp Jackson Affair however, Price joined Jackson in secretly asking for the Confederacy to send troops to occupy Missouri. Harney returned from Washington on May 12 and immediately attempted to negotiate a truce. On May 16, responding to requests from the mayor of St. Louis to have Lyon relieved of his post in Missouri, Attorney General Edward Bates presented two representatives of the city to President Lincoln. Frank Blair's brother and Postmaster General Montgomery Blair and War Secretary Simon Cameron intervened on Lyon's behalf, urging Lincoln to retain him. Lincoln sided with the Blairs and Cameron. A week later, Harney met with Price and drafted the Price-Harney Truce, which read: General Price, having by commission full authority over the militia of the State of Missouri, undertakes, with the sanction of the governor of the State, already declared, to direct the whole power of the State officers to maintain order within the State among the people thereof, and General Harney publicly declares that, this object being thus assured, he can have no occasion, as he has no wish, to make military movements, which might otherwise create excitements and jealousies which he most earnestly desires to avoid. The truce temporarily alleviated the mounting hostilities in Missouri but also left Lyon and Blair discontent. The truce restricted Federal forces to St. Louis, while allowing Jacksons new pro-confederate Missouri State Guard to move freely in the rest of the state.