The cloud was on the Federal flank and everything indicated that it was the army of Patterson, marching from the Valley of Virginia.
Harry and his comrades had also seen the dust, and they regarded it anxiously.

They knew as well as any general present that their fate lay within that cloud.
"It's coming fast, and it's growing faster," said Harry.

"I've got so used to the roar of this battle that it seems to me alien sounds are detached from it, and are heard easily.

I can hear the rumble of cannon wheels in that cloud." "Then tell us, Harry," said Langdon, "is it a Northern rumble or a Southern rumble that you hear ?" Harry laughed.
"I'll admit it's a good deal of a fancy," he said.
Arthur St.Clair suddenly leaped high in the air, and uttered at the very top of his voice the wild note of the famous rebel yell.
"Look at the flags aloft in that cloud of dust! It's the Star and Bars! God bless the Bonnie Blue Flag! They are our own men coming, and coming in time!" Now the battle flags appeared clearly through the dust, and the great rebel yell, swelling and triumphant, swept the whole Southern line.
It was the remainder of Johnston's Army of the Shenandoah.

It had slipped away from Patterson, and all through the burning day it had been marching steadily toward the battlefield, drummed on by the thudding guns.