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.