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| 42nd Illinois Infantry Regiment | |
|---|---|
| Unit name | 42nd Illinois Infantry Regiment |
| Country | United States |
| Allegiance | Union |
| Branch | Union Army |
| Type | Infantry |
| Dates | 1861–1865 |
| Size | Regiment |
| Garrison | Chicago, Springfield, Illinois |
| Notable commanders | John Milton Palmer, Ozora P. Stearns |
42nd Illinois Infantry Regiment was an infantry regiment that served in the Union Army during the American Civil War. Raised in Illinois in 1861, the regiment participated in major Western Theater operations, campaigning in states such as Missouri, Kentucky, Tennessee, Mississippi, and Georgia. Its service intersected with prominent formations and leaders including the Army of the Tennessee, Ulysses S. Grant, William T. Sherman, and engagements that shaped campaigns from the Vicksburg Campaign to the Atlanta Campaign.
Mustered in at Chicago, Springfield, and surrounding counties in late 1861, the regiment drew volunteers from Cook County, St. Clair County, and other Illinois communities. Organized under state authority and mustered into Federal service, the regiment was assigned to brigades within divisions of the Army of the Tennessee and attached at various times to commands under Ulysses S. Grant, John A. Logan, and William S. Rosecrans. The regiment’s organizational record links it to Department of the Missouri, Army of the Mississippi, and later corps structures such as the XV Corps.
After initial garrison and training duty in Illinois and Missouri, the 42nd moved into active operations in the Mississippi Valley during the 1862 campaigns. The regiment joined operations aimed at securing river communications, supporting sieges and riverine expeditions associated with the Vicksburg Campaign and actions against Confederate positions along the Mississippi River. In 1863–1864 the regiment served in the push through the Deep South, participating in maneuvers that connected with generals James B. McPherson, John A. Logan, and later with William T. Sherman’s strategic movements. During the Atlanta Campaign the unit operated in coordination with corps under John M. Palmer and elements of the Army of the Cumberland. Following the fall of Atlanta the regiment was involved in operations related to the March to the Sea and subsequent Carolinas operations leading toward the surrender of Joseph E. Johnston’s forces.
The 42nd Illinois saw action at key engagements including preliminary operations in Missouri and clashes near Shiloh-era theaters, the series of confrontations and sieges comprising the Vicksburg Campaign, and the prolonged offensives of the Chattanooga Campaign. In 1864 the regiment participated in the Atlanta Campaign, which included fights at locations tied to assaults on Kennesaw Mountain, skirmishes near Kirkwood, and efforts advancing on Jonesborough. Elements of the regiment were engaged in operations during the March to the Sea and the Carolinas Campaign, including confrontations that contributed to the collapse of Confederate resistance preceding the Appomattox Campaign’s culmination of major Confederate surrenders.
Command leadership included field officers and colonels such as John Milton Palmer, who later engaged in politics in Illinois and whose wartime service connected him to Union command circles. Other officers who led companies or served on the regimental staff had prior militia experience in local institutions, and several went on to postwar civic roles in cities like Chicago and Peoria. The regiment’s chain of command interacted with division and corps commanders including William T. Sherman, Ulysses S. Grant, James B. McPherson, and corps commanders of the XV Corps and XIV Corps during major campaigns.
Over its term of service the regiment’s strength fluctuated from initial muster rolls of several hundred men to cumulative figures increased by recruits and reduced by casualties, disease, and expirations of service. The unit suffered combat casualties in assaults and skirmishes during the Vicksburg Campaign and Atlanta Campaign, and non-combat losses from disease—notably fever and dysentery common in riverine and southern theaters—mirroring trends recorded across Union regiments. Men were discharged upon expiration of enlistment, transferred to other units, or returned home after mustering out in 1865 following the Confederacy’s collapse.
As a Union infantry regiment, members of the 42nd Illinois wore standard issue United States Army tunics, forage caps, and wool trousers supplied through Quartermaster channels, and were armed with muskets and rifled small arms typical of Western Theater units, including variants of the Springfield Model 1861 and imported Pattern 1853 Enfield. Regimental markings and company letters were applied on accoutrements such as cartridge boxes and flags; colors and guidons bore designs consistent with state-issued banners orchestrated by the Adjutant General of Illinois and reflected unit identity alongside national colors.
The 42nd Illinois’ veterans participated in postwar commemorations, veterans’ reunions, and organizations such as the Grand Army of the Republic and state veteran associations in Illinois. Monuments and memorial tablets referencing the regiment appear at battlefields and county courthouses, often dedicated in ceremonies with figures from the Republican Party and civic leaders who served in Corps and state legislatures. Regimental records, muster rolls, and personal letters are preserved in collections at institutions like the Illinois State Archives, Abraham Lincoln Presidential Library and Museum, and local historical societies, contributing to scholarship on Union operations in the Western Theater and the broader course of the American Civil War.
Category:Units and formations of the Union Army from Illinois Category:Military units and formations established in 1861 Category:Military units and formations disestablished in 1865