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.
Opposite McDowell, at Manassas Junction, about thirty miles from Washington, lay a Confederate army under Brigadier-General Beauregard who, three months before, had won the homage of the South by reducing Fort Sumter. Opposed to Patterson in the Shenandoah valley was Joseph E. Johnston with a force of nine thousand men. The plans of the President and General Scott were to send McDowell against Beauregard, while Patterson was to detain Johnston in the Valley and prevent him from joining Beauregard. It was confidently believed that, if the two Confederate forces could be kept apart, the “Grand Army” could win a signal victory over the force at Manassas; and on July 16th, with waving banners and lively hopes of victory, amid the cheers of the multitude, it moved out from the banks of the Potomac toward the interior of Virginia. It was a motley crowd, dressed in the varied uniforms of the different State militias. The best disciplined troops were those of the regular army, represented by infantry, cavalry, and artillery. Even the navy was drawn upon and a battalion of marines was included in the Union forces. In addition to the regulars were volunteers from all the New England States, from New York and Pennsylvania and from Ohio, Michigan, and Minnesota, organizations which, in answer to the President’s call for troops, had volunteered for three months’ service. Many were boys in their teens with the fresh glow of youth on their cheeks, wholly ignorant of the exhilaration, the fear, the horrors of the battle-field. Onward through the Virginia plains and uplands they marched to the strains of martial music. Unused to the rigid discipline of war, many of the men would drop out of line to gather berries or tempting fruits along the roadside, or to refill their canteens at every fresh stream of water, and frequent halts were necessary to allow the stragglers to regain their lines.
After a two days’ march, with “On to Richmond” as their battle-cry, the army halted at the quiet hamlet of Centreville, twenty-seven miles from Washington and seven miles from Manassas Junction where lay the waiting Confederate army of similar composition—untrained men and boys. Men from Virginia, from North and South Carolina, from the mountains of Tennessee, from Alabama, Mississippi, and Georgia, even from distant Arkansas, had gathered on the soil of the Old Dominion State to do battle for the Southern cause. Between the two armies flowed the stream of Bull Run, destined to give its name to the first great battle of the impending conflict. The opposing commanders, McDowell and Beauregard, had been long-time friends; twenty-three years before, they had been graduated in the same class at West Point.
Beauregard knew of the coming of the Federal army. The news had been conveyed to him by a young man, a former government clerk at Washington, whose sympathies, however, lay with the cause of the South. He won the confidence of Beauregard. The latter sent him to the capital city bearing a paper with two words in cipher, “Trust Bearer.” With this he was to call at a certain house, present it to the lady within, and wait a reply. Traveling all night, he crossed the Potomac below Alexandria, and reached the city at dawn, when the newsboys were calling out in the empty streets the latest intelligence of the army. The messenger rang the doorbell at a house within a stone’s throw of the White House and delivered the scrap of paper to the only one in the city to whom it was intelligible. She hurriedly gave the youth his breakfast, wrote in cipher the words, “Order issued for McDowell to march upon Manassas to-night,” and giving him the scrap of paper, sent him on his way. That night the momentous bit of news was in the hands of General Beauregard. He instantly wired President Davis at Richmond and asked that he be reënforced by Johnston’s army.
As we have seen, General Scott had arranged that Patterson detain Johnston in the Valley. He had even advised McDowell that “if Johnston joins Beauregard he shall have Patterson on his heels.” But the aged Patterson was unequal to the task before him. Believing false reports, he was convinced that Johnston had an army of thirty-five thousand men, and instead of marching upon Johnston at Winchester he led his army to Charlestown, twenty miles in the opposite direction. Johnston thereupon was free to join Beauregard at Manassas, and he promptly proceeded to do so.
McDowell’s eager troops had rested at Centreville for two days. The time for them to test their mettle in a general engagement was at hand. Sunday, July 21st, was selected as the day on which to offer battle. At half-past two in the morning the sleeping men were roused for the coming conflict. Their dream of an easy victory had already received a rude shock, for on the day after their arrival a skirmish between two minor divisions of the opposing armies had resulted in the retreat of the Union forces after nineteen of their number lay dead upon the plain. The Confederates, too, had suffered and fifteen of their army were killed. But patriotic enthusiasm was too ardent to be quenched by such an incident, and eagerly, in the early dawn of the sultry July morning, they marched toward the banks of the stream on which they were to offer their lives in the cause of their country.
The army moved out in three divisions commanded by Generals Daniel Tyler, David Hunter, and S. P. Heintzelman. Among the subordinate officers was Ambrose E. Burnside, who, a year and five months later, was to figure in a far greater and far more disastrous battle, not many miles from this same spot; and William T. Sherman, who was to achieve a greater renown in the coming war.