On the crest of the hill across the narrow valley two field guns frowned on the bridge, the cannoneers standing motionless at their posts, seeming to wait only the command to open fire. In front of them, long lines of dismounted cavalry were reaching out, like slowly unfolding ribbons, against the brown face of the hill. Al and Wallace watched them curiously. Would they never cease to extend? All at once an officer on a black horse darted up to the two field guns as if shot out of the woods behind. They could see him point his arm toward the bridge, gesturing emphatically. Then the cannoneers sprang to life, two vivid streaks of fire spurted from the muzzles of the guns and Al felt, rather than heard, a terrific explosion which seemed to take place all around him at once. Following it came a sensation of intense, numbing silence that was at length pierced by the thin, liquid vibration of a bugle, blowing somewhere far off, "the charge." Then gradually other sounds came to his reviving ear-drums, and he realized that a shell had burst directly over his head, though he was unhurt. He glanced at Wallace, whose eyes looked dazed. "Wasn't that awful?" whispered Al. "Awful, yes. Awful," repeated Wallace. He seemed almost beyond words. But he suddenly hitched up on his knees, exclaiming, "There, look! They're coming!" Al turned his eyes to the front. The long, ribbon-like line of Confederates was pitching forward down the hill and out across the floor of the valley toward them. Two flags, fluttering blotches of red and blue, tilted forward above it. Little ripples ran back and forth along the line, like the wind ripples in growing wheat, as the men strained to keep alignment; and ahead of them whirled a shrill, ear-piercing wave of sound more united, more defiant and more formidable than any Indian war-whoop the boys had ever heard. It came to their senses that they were listening for the first time to that heart-chilling "rebel yell" of which they had so often been told. An officer walked rapidly along behind their own line, his voice, high-keyed with excitement, striving vainly to be reassuring. "Now, boys, now, don't get scared," he kept repeating. "Hang it all, hold your fire, men! Hold your fire!" All at once the volume of yells ceased. Al and Wallace looked to the front and saw that the whole line of the enemy had stopped, rigid as a fence. Even as they looked, a volley blazed along the line as if fired from one gun. The fat man beside Al dropped his musket and began to cry, frantically, "Oh, oh, oh, my shoulder! Oh, oh, oh, my shoulder!" There was no time to heed him. Through the wall of smoke before them, created by the volley, again broke the Confederates on the run, their dreadful yell preceding them, the two frayed battle flags eddying above the smoke like the masts of catboats in a seaway. "Lord, Al, they don't fight like Indians!" gasped Wallace, hoarsely.