At three o'clock the Rebel troops were under arms, their breakfasts eaten, their blankets folded, their knapsacks laid aside. They were to move unencumbered, that they might fight with more vigor. The morning brightened, and the long lines moved through the forest. The Union army was asleep. The reveille had not been beaten. The soldiers were still dreaming of home, or awaiting the morning drum-beat. The mules and horses were tied to the wagons, whinnying for their oats and corn. A few teamsters were astir. Cooks were rekindling the smouldering camp-fires. The pickets, a mile out, had kept watch through the night. There had been but little firing. There was nothing to indicate the near approach of fifty thousand men. Beauregard had ordered that there should be no picket-firing through the night. General Prentiss had strengthened his picket-guard on the Corinth Ridge road Saturday night. Some of his officers reported that Rebel cavalry were plenty in the woods. He therefore doubled his grand guard, and extended the line. He also ordered Colonel Moore, of the Twenty-first Missouri, to go to the front with five companies of his regiment. Colonel Moore marched at three o'clock. General Prentiss did not expect a battle, but the appearance of the Rebels along the lines led him to take these precautions. About the time Colonel Moore reached the pickets the Rebel skirmishers came in sight. The firing began. The pickets resolutely maintained their ground, but the Rebels pushed on. Colonel Moore, hearing the firing, hastened forward. It was hardly light enough to distinguish men from trees, but the steady advance of the Rebels convinced him that they were making a serious demonstration. He sent a messenger to General Prentiss for the balance of his regiment, which was sent forward. At the same time General Prentiss issued orders for the remainder of his division to form. [Illustration: PITTSBURG LANDING. 1 Hurlburt's division. 2 W. H. L. Wallace's division. 3 McClernand's division. 4 Sherman's division. 5 Prentiss's division. 6 Stuart's brigade. 7 Lewis Wallace's division. 8 Gunboats. 9 Transports. 10 Ravine. A Hardee's line. B Bragg's line. C Polk's line. D Breckenridge's reserves.] His entire force was seven regiments, divided into two brigades. The first brigade was commanded by Colonel Peabody, and contained the Twenty-fifth Missouri, Sixteenth Wisconsin, and Twelfth Michigan. The second brigade was composed of the Eighteenth and Twenty-third Missouri, Eighteenth Wisconsin, and Sixty-first Illinois. The Twenty-third Missouri was at Pittsburg Landing, having just disembarked from a transport, and was not with the brigade till nearly ten o'clock. When the firing began, its commander, having been ordered to report to General Prentiss, moved promptly to join the division.