Gen. Lyon was a thorough organizer, and had his work well in hand with every one of his subordinates fully instructed as to his part. The previous military training of the Germans here came into good play, and regiments formed quickly and moved promptly. Col. Blair, with his regiment and a battalion of Regulars, marched to a position on the west of the camp. Col. Schuttner with his regiment went up Market street; Col. Sigel led his column up Olive street; Col. Brown went up Morgan street; and Col. McNeil up Clark avenue. A battery of six pieces went with a Regular battalion, at the head of which rode Gen. Lyon. The news of the movement rapidly diffused through the city; everybody was excited and eagerly expectant; and the roofs of the houses were black with people watching events. Not the least important, factor were the Secessionist belles of the city, whose lovers and brothers were in Camp Jackson, and who, with that inconsequence which is so charming in the young feminine mind, were breathlessly expectant of their young heroes each surrounding himself with a group of "Dutch myrmidons," slain by his red right hand. So admirably had Lyon planned that the heads of all his columns appeared at their designated places almost simultaneously, and Gen. Frost found his camp entirely surrounded in the most soldierly way. The six light pieces galloped into position to entirely command the camp. With a glance of satisfaction at the success of his arrangements, Gen. Lyon rode up to Sweeny, his second in command, and said: "Sweeny, if their batteries open on you, deploy your leading company as skirmishers, charge on the nearest battery, and take it." Sweeny turned to the next two companies to him, and ordered them to move their cartridge-boxes to the front, to prepare for action. Lyon then sent Maj. B. G. Farrar with the following letter to Gen. Frost: 76 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 to the Government of the United States.