It can now be seen that still a third element--geography--intervened to give shape and sequence to the main outlines of the Civil War. When, at the beginning of May, General Scott gave his advice, the seat of government of the first seven Confederate States was still at Montgomery, Alabama. By the adhesion of the four interior border States to the insurrection, and the removal of the archives and administration of Jefferson Davis to Richmond, Virginia, toward the end of June, as the capital of the now eleven Confederate States, Washington necessarily became the center of Union attack, and Richmond the center of Confederate defense. From the day when McDowell began his march to Bull Run, to that when Lee evacuated Richmond in his final hopeless flight, the route between these two opposing capitals remained the principal and dominating line of military operations, and the region between Chesapeake Bay and the Potomac River on the east, and the chain of the Alleghanies on the west, the primary field of strategy. According to geographical features, the second great field of strategy lay between the Alleghany Mountains and the Mississippi River, and the third between the Mississippi River, the Rocky Mountains, and the Rio Grande. Except in Western Virginia, the attitude of neutrality assumed by Kentucky for a considerable time delayed the definition of the military frontier and the beginning of active hostilities in the second field, thus giving greater momentary importance to conditions existing and events transpiring in Missouri, with the city of St. Louis as the principal center of the third great military field. The same necessity which dictated the promotion of General McClellan at one bound from captain to major-general compelled a similar phenomenal promotion, not alone of officers of the regular army, but also of eminent civilians to high command and military responsibility in the immense volunteer force authorized by Congress. Events, rather than original purpose, had brought McClellan into prominence and ranking duty; but now, by design, the President gave John C. Fremont a commission of major-general, and placed him in command of the third great military field, with headquarters at St. Louis, with the leading idea that he should organize the military strength of the Northwest, first, to hold Missouri to the Union, and, second, by a carefully prepared military expedition open the Mississippi River. By so doing, he would sever the Confederate States, reclaim or conquer the region lying west of the great stream, and thus reduce by more than one half the territorial area of the insurrection. Though he had been an army lieutenant, he had no experience in active war; yet the talent and energy he had displayed in Western military exploration, and the political prominence he had reached as candidate of the Republican party for President in 1856, seemed to fit him preeminently for such a duty.