Of the five divisions at Pittsburg Landing, the organization of four--the First, McClernand's; Second, C.F. Smith's, commanded by Brigadier-General W.H.L. Wallace, General Smith being ill at Savannah; the Fourth, Hurlbut's; and the Fifth, Sherman's--was completed. The Sixth, commanded by Prentiss, was still in process of formation. McClernand's First Brigade, composed of the Eighth and Eighteenth Illinois, Eleventh and Thirteenth Iowa, was commanded by Colonel Hare, of the Eleventh Iowa; the Second was composed of the Eleventh, Twentieth, Forty-fifth, and Forty-eighth Illinois, and commanded by Col. Marsh, of the Twentieth Illinois; the Third, of the Seventeenth, Twenty-ninth, Forty-third, and Forty-ninth Illinois. Colonel Ross, of the Seventeenth Illinois, the senior colonel, being ill and absent, the command of this brigade devolved on Colonel Reardon, of the Twenty-ninth. The Second Division comprised three brigades: the First, commanded by Colonel Tuttle, of the Second Iowa, contained the Second, Seventh, Twelfth, and Fourteenth Iowa; the Second, commanded by Brigadier-General McArthur, comprised the Thirteenth and Fourteenth Missouri, Ninth and Twelfth Illinois, and Eighty-first Ohio. The Fourteenth Missouri, at that time, went by the name of Birge's Sharpshooters; the Third, commanded by Colonel Sweeney, of the Fifty-second Illinois, comprised the Eighth Iowa, and the Seventh, Fiftieth, Fifty-second, Fifty-seventh, and Fifty-eighth Illinois. The Fourth Division contained three brigades: the First, commanded by Colonel Williams, of the Third Iowa, contained the Third Iowa, Twenty-eighth, Thirty-second, and Forty-first Illinois; the Second, commanded by Colonel Veatch, of the Twenty-fifth Indiana, contained the Twenty-fifth Indiana, Fourteenth, Fifteenth, and Forty-sixth Illinois; the Third, commanded by Brigadier-General Lauman, who reported for duty Saturday, April 5th, and was then assigned to this command, comprised the Thirty-first and Forty-fourth Indiana, and the Seventeenth and Twenty-fifth Kentucky. The Fifth Division contained four brigades: the First, commanded by Colonel McDowell, of the Sixth Iowa, was made of the Sixth Iowa, Forty-sixth Ohio, and the Fortieth Illinois; the Second, commanded by Colonel Stuart, of the Fifty-fifth Illinois, was made of the Fifty-fifth Illinois and the Fifty-fourth and Seventy-first Ohio; the Third, commanded by Colonel Hildebrand, of the Seventy-seventh Ohio, contained the Fifty-third, Fifty-seventh, and Seventy-seventh Ohio; the Fourth, commanded by Colonel Buckland, of the Seventy-second Ohio, contained the Forty-eighth, Seventieth, and Seventy-second Ohio. The Sixth Division was organized into two brigades: the First Brigade, commanded by Colonel Peabody, of the Twenty-fifth Missouri, contained the Twenty-first and Twenty-fifth Missouri, Twelfth Michigan, and Sixteenth Wisconsin. The Second, commanded by Colonel Miller, of the