The 13th Michigan Infantry was organized at Kalamazoo, Michigan, and mustered into service for three years enlistment on January 17, 1862, under the command of Colonel Charles Edward Stuart. The regiment was attached to 15th Brigade, 4th Division, Army of the Ohio, to March 1862. 20th Brigade, 6th Division, Army of the Ohio, to September 1862. 20th Brigade, 6th Division, II Corps, Army of the Ohio, to November 1862. 3rd Brigade, 1st Division, Left Wing, XIV Corps, Army of the Cumberland, to January 1863. 3rd Brigade, 1st Division, XXI Corps, to April 1863. 1st Brigade, 1st Division, XXI Corps, to October 1863. 2nd Brigade, 2nd Division, IV Corps, Army of the Cumberland, to November 1863. Engineer Brigade, Department of the Cumberland, to October 1864. 2nd Brigade, 1st Division, XIV Corps, Army of the Cumberland, to July 1865. The 13th Michigan Infantry mustered out of service at Louisville, Kentucky, on July 25, 1865. Company A - Kalamazoo County and Barry County Company B - Allegan County and Barry County Company C - Allegan County and Kent County Company D - Calhoun County Company E - Kalamazoo County Company F - Jackson County, Ionia County, and Eaton County Company G - Kalamazoo County Company H - Kalamazoo County Company I - Allegan County Company K - Van Buren County and Calhoun County Unassigned Company - Kalamazoo County and Jackson County

The 7th Michigan Infantry was organized at Monroe, Michigan and mustered into Federal service for a three-year enlistment on August 22, 1861. Among the ranks was future brigadier general Henry Baxter, who was captain of Company C. The 7th was assigned to the Army of the Potomac soon after it was formed and served in the 3rd Brigade, 2nd Division, 2nd Corps, for the duration of the war. Sister regiments in the 3rd Brigade included the 19th Massachusetts, 20th Massachusetts, 42nd New York, and 59th New York. Infantryman William Rufus Shafter was wounded at the Battle of Fair Oaks; he later received the Medal of Honor for heroism during the battle. The 7th was one of the first regiments to cross the Rappahannock River on Dec. 11th, 1862 while under fire from Confederate sharpshooters hidden in the buildings of Fredericksburg, the first opposed riverine assault in American military history. In July 1862, Norman J. Hall, a Regular Army artilleryman assumed command of the regiment and led it until he was promoted to brigade command before the Battle of Gettysburg. The regiment was mustered out on July 5, 1865.

The Michigan 23rd Infantry Regiment fought the entire war in the west, beginning in the summer of 1862. They missed the siege of Nashville while pursuing Confederate troops in Tennessee and Kentucky and they also missed the Battle of Chickamauga while involved in follow-up operations at Knoxville. The regiment participated in the Atlanta Campaign followed by Franklin and Nashville, and then participated in Sherman's Carolina Campaign and the final battles at Bentonville and Averasboro. For some unknown reason, they did not participate in the Grand Review in Washington, but were mustered out in late May, 1865 and returned home by rail. With a total enrollment of 1,417, the 23rd had 41 men killed in action, 8 died of wounds and 228 of disease for a total casualty rate of 20%. Company A - Clinton County Company B - Saginaw County Company C - Genesee County Company D - Tuscola County Company E - Saginaw County and Alcona County Company F - Bay County and Huron County Company G - Clinton County Company H - Kent County and Shiawassee County Company I - Houghton County and Kalamazoo County Company K - Genesee County Unassigned Company - Genesee County

The Iowa 13th Infantry regiment was organized in the summer and fall of 1861 and was mustered in between Oct. 18 and Nov. 2, by companies. On March 8 1862 it left for Pittsburg landing, where it was assigned to the 1st brigade, 1st division, Gen. McClernand commanding. It fought with the Army of Tennessee beginning with Shiloh where it lost 24 killed and 139 wounded. It participated all the major battles, ending with Bentonville, NC in 1865.The 13th lost during service 5 Officers and 114 Enlisted men killed and mortally wounded and 4 Officers and 205 Enlisted men by disease. Total 328.-Company A - Linn County-Company B - Jasper County-Company C - Lucas County-Company D - Keokuk County-Company E - Scott County, Story County, Polk County and Jasper County-Company F - Linn County-Company G - Benton County-Company H - Marshall County; also many men from Monroe County-Company I - Washington County, Powesheik County and Iowa County-Company K - Washington County

The 11th Regiment, Michigan Infantry was organized at White Pigeon, Michigan. It mustered in September 24, 1861. The 11th fought in the West and was strongly engaged at Stones River, Chickamauga, Missionary Ridge, Kennesaw and Peach Tree Creek. The regiment mustered out September 30, 1864. Recruits were formed into a detachment and transferred to the 11th Regiment reorganized. Company A - St. Joseph County and Jackson County Company B - Branch County Company C - St. Joseph County Company D - St. Joseph County and Branch County Company E - St. Joseph County Company F - Lenawee County Company G - Lenawee County and St. Joseph County Company H - Branch County Company I - Monroe County Company K - Lenawee County Unassigned Company - St. Joseph County and Jackson County

The Georgia 13th Infantry Regiment initially mustered into Confederate service on July 8, 1861. Georgia Militia Major General William Ector was named Colonel of this regiment at organization. They served briefly with Brig. Gen. John B. Floyd's brigade in West Virginia, seeing minor action at the Battles of Sewell Mountain and Laurel Hill before being returned to Georgia due to sickness and lack of clothing suitable for the harsh winter climate in the West Virginia mountains. While on coastal duty in Georgia in early 1862, they engaged in a number of skirmishes, including the capture of a gunboat that afterwards bore their name and a skirmish with the 8th Michigan on Whitemarsh Island, Georgia on April 16, 1862. The regiment returned to Virginia in time to participate in the Seven Days Battles. They were placed in the Lawton-Gordon-Evans Georgia Brigade (so-named for its three principal commanders). It was one of the premier brigades of Robert E. Lee's Army of Northern Virginia, serving with distinction from the Seven Days battles around Richmond (May-June 1862) until its surrender at Appomattox Court House (April 9, 1865). Companies Of The Georgia 13th Infantry Regiment Company A - Confederate Guards (Pike County) Company B - Meriwether Volunteers (Meriwether and Troup Counties) Company C- Ringgold Rangers (Ringgold, Georgia and Catoosa County) Company D - Upson Volunteers Company E - Randolph Volunteers (Randolph and Terrell Counties) Company F - Fayette Rangers (Fayette County) Company G - Early Guards (Early County) Company H - Panola Rifles (Terrell County) Company I - Stark Volunteers (Spalding County) Company K - Evans Guards (Troup County)