The whole line of the Invincibles quivered with excitement, and then Harry saw that the rumor was true, or that their commander at least believed it to be so. The firing stopped entirely and the bugles blew the retreat. All the brigades gathered themselves up and, wild with anger and chagrin, slowly withdrew. "Why are we retreating?" exclaimed Langdon, angrily. "Not a Yankee set his foot on the bridge! We're not whipped!" "No," said Harry, "we're not whipped, but if we don't retreat we will be. If fifteen or twenty thousand Yankees struck us on the flank while those fellows are still in front everything would go." These were young troops, who considered a retreat equivalent to a beating, and fierce murmurs ran along the line. But the officers paid no attention, marching them steadily on, while the artillery rumbled by their side. Both to right and left they heard the sound of firing, and they saw the smoke floating against both horizons, but they paid little attention to it. They were wondering what was in store for them. "Cheer up, you lads!" cried Colonel Talbot. "You'll get all the fighting you can stand, and it won't be long in coming, either." They marched only half an hour and then the troops were drawn up on a hill, where the officers rapidly formed them into position. It was none too soon. A long blue line, bristling with cannon on either flank, appeared across the fields. It was Burnside with the bulk of the Northern army moving down upon them. Harry was standing beside Colonel Talbot, ready to carry his orders, and he heard the veteran say, between his teeth: "The Yankees have fooled us, and this is the great battle at last." The two forces looked at each other for a few moments. Elsewhere great guns and rifles were already at work, but the sounds came distantly. On the hill and in the fields there was silence, save for the steady tramp of the advancing Northern troops. Then from the rear of the marching lines suddenly came a burst of martial music. The Northern bands, by a queer inversion, were playing Dixie: "In Dixie's land I'll take my stand, To live and die for Dixie. Look away! Look away! Down South in Dixie." Harry's feet beat to the tune, the wild and thrilling air played for the first time to troops going into battle. "We must answer that," he said to St. Clair. "Here comes the answer," said St. Clair, and the Southern bands began to play "The Girl I Left Behind Me." The music entered Harry's veins. He could not look without a quiver upon the great mass of men bearing down upon them, but the strains of fife and drum put courage in him and told him to stand fast. He saw the face of Colonel Talbot grow darker and darker, and he had enough experience himself to know that the odds were heavily against them.