Organized at Davenport, Iowa, in October, 1861. It served in Missouri until the spring of 1862, when it moved with Grant to Pittsburg Landing, Tenn., and fought at Shiloh, it being then in McClernand's Division; loss, 20 killed, 139 wounded, and 3 missing; a total of 162, out of 717 present in action. Soon after this battle the famous Iowa Brigade -- Eleventh, Thirteenth, Fifteenth and Sixteenth Iowa-- was organized, and placed under command of Colonel Crocker. This brigade participated in the Siege of Corinth, and on October 4th, 1862, in the battle at that place, in which the Thirteenth lost 1 killed and 14 wounded. During the Vicksburg campaign the brigade was under the command of Colonel Hall, and served in McArthur's Division, Seventeenth Corps. The autumn of 1863, and most of the following winter, was passed in camp at Vicksburg. In February, 1864, it was engaged in Sherman's March to Meridian, Miss., after which the regiment, having reënlisted, went home on a "veteran furlough." The reënlistments numbered 379, officers and men, which, with the recruits, preserved the organization after its term of service had expired. Upon its return it entered the Atlanta campaign, the Iowa Brigade serving as the Third Brigade of Gresham's (4th) Division, Seventeenth Corps. At the battle of Atlanta --July 21st and 22d -- the regiment, under Colonel Shane, was in the thickest of the fight, losing 247 in killed, wounded and missing, out of 410 present for duty; Major Wm. A. Walker, a gallant officer, was killed in the second day's fight. The regiment marched through Georgia to the Sea, and was the first to enter Columbia, S.C. (February 17, 1865), its colors being the first to wave over the State Capitol.