... Headquarters, United States troops, St. Louis, (Mo.,) May 10, 1861. Gen. D. M. Frost, Commanding Camp Jackson: Sir: Your command is regarded as evidently hostile towards the Government of the United States . It is, for the most part, made up of those secessionists who have openly avowed their hostility to the General Government, and have been plotting at the seizure of its property and the overthrow...