 Disguised as a woman, Captain Lyon scoured the camp, searching for evidence of any secessionist threat.Lyon and his agents discovered falsely labeled crates containing a number of siege guns to be used for assaulting the Missouri arsenal, sent by the Confederate President Jefferson Davis himself.On May 10, 1861, Lyon, a Radical Republican, marched a large contingent of pro-southern Missouri militia prisoners-of-war through the streets of St. Louis.