This did not catch Gen. Lyon at all unawares. He had long ago determined upon a movement to Springfield, which, being in the midst of the farming region, was the center of the Union element of southwest Missouri. Immediately, upon reading the Governor's proclamation, he saw the necessity of forestalling the projected concentration by reaching Jefferson City with the least possible delay. Before he retired that night he had given orders for the formation of a marching column, and had placed the affairs of his great Department outside of this column, of which he proposed to take personal command, in the hands of Col. Chester Harding, to whom he gave full powers to sign his name and issue orders. 121 Having thought out his plans well beforehand, Gen. Lyon began his campaign with well-ordered celerity. Part of the troops he had at command were sent down the southwestern branch of the Pacific Railroad to secure it. Others were sent to points at which the militia were known to be gathering to disperse them. Gen. Lyon himself, with his staff, the Regulars, infantry and artillery, and a force of volunteers, embarked on two steamboats to move directly upon Jefferson City by the way of the Missouri River. They arrived at the Capital of Missouri about 2 o'clock in the afternoon of June 15, and were met with an enthusiastic reception from the loyal citizens, of whom a large proportion were Germans. Gov. Jackson had only been able to assemble about 120 men, with whom he made a hasty retreat to Boonville, about 50 miles further up the river, which had been selected by Gen. Price as one of his principal strategic points. Boonville is situated on the highlands at a natural crossing of the Missouri, and by holding it communication could be maintained between the parts of the State lying north and south of the river, and thus allow the concentration of the Militia, which Gov. Jackson had called out. The hights on the river bank would enable the river to be blockaded against expeditions ascending it, and the entire length of the stream to Kansas City, about 100 miles in a direct line, could be thus controlled. The Missouri River divides the State unequally, leaving about one-third on the north and two-thirds on the south. Of the 99 Counties in the State, 44 are north of the Missouri River, but these are smaller than those south. 122 Gov. Jackson had telegraphed orders for the Brigade-Generals commanding the districts into which the State had been divided to concentrate their men with all haste at Boonville and at Lexington, still further up the river, nearly midway between Boonville and Kansas City. The beginnings of an arsenal were made at Boonville, to furnish arms and ammunition.