Two governments, each representing a different economic and political idea, now stood where there had been but one--the North, with its powerful industrial organization and wealth; the South, with its rich agricultural empire. Both were calling upon the valor of their sons. At the nation's capital all was confusion and disorder. The tramp of infantry and the galloping of horsemen through the streets could be heard day and night. Throughout the country anxiety and uncertainty reigned on all sides. Would the South return to its allegiance, would the Union be divided, or would there be war? The religious world called unto the heavens in earnest prayer for peace; but the rushing torrent of events swept on toward war, to dreadful internecine war. The first call of the President for troops, for seventy-five thousand men, was answered with surprising alacrity. Citizens left their farms, their workshops, their counting rooms, and hurried to the nation's capital to take up arms in defense of the Union. A similar call by the Southern President was answered with equal eagerness. Each side believed itself in the right. Both were profoundly sincere and deeply in earnest. Both have won the respect of history. After the fall of Fort Sumter, the two sides spent the spring months marshaling their forces for the fierce conflict that was to follow. President Lincoln had called for three-months' volunteers; at the beginning of July some thirty thousand of these men were encamped along the Potomac about the heights of Arlington. As the weeks passed, the great Northern public grew impatient at the inaction and demanded that Sumter be avenged, that a blow be struck for the Union. The "call to arms" rang through the nation and aroused the people. No less earnest was the feeling of the South, and soon two formidable armies were arrayed against each other, only a hundred miles apart--at Washington and at Richmond. The commander of the United States Army was Lieut.-General Winfield Scott, whose military career had begun before most of the men of '61 had been born. Aged and infirm, he remained in Washington. The immediate command of the army was entrusted to Brigadier-General Irvin McDowell. Another Union army, twenty thousand strong, lay at Martinsburg, Virginia, under the command of Major-General Patterson, who, like General Scott, was a veteran of the War of 1812 and of the Mexican War.