XV Corps (Union Army)

XV Corps (Union Army). The XV Corps was a prominent infantry formation of the Union Army during the American Civil War. Created in late 1862, it served exclusively within the famed Western Theater as a key component of the Army of the Tennessee. Known for its hard-fighting reputation and distinctive badge, the corps played a decisive role in several major campaigns under celebrated commanders like Ulysses S. Grant and William T. Sherman.

Formation and early history

The XV Corps was officially constituted on December 18, 1862, from troops previously belonging to the right wing of the Army of the Tennessee. Its initial organization occurred at La Grange, Tennessee, under the direct authority of General Ulysses S. Grant. The corps was formed during a period of reorganization following the Battle of Corinth and in preparation for the critical campaign against the Confederate stronghold at Vicksburg, Mississippi. Many of its original regiments were veteran units from Illinois, Ohio, Indiana, Iowa, and Missouri that had already seen significant action at battles like Fort Donelson and Shiloh.

Civil War service

The XV Corps saw continuous and arduous service from its inception until the war's conclusion. It was a central element of the Vicksburg Campaign, participating in pivotal engagements such as the Battle of Raymond, the Battle of Jackson, and the Battle of Champion Hill before enduring the protracted Siege of Vicksburg. Following the fall of Vicksburg, the corps joined William T. Sherman's forces during the Meridian campaign and the Atlanta Campaign. It fought fiercely at the Battle of Resaca, the Battle of Kennesaw Mountain, and the Battle of Atlanta, where its commander, John A. Logan, temporarily led the Army of the Tennessee. The corps then formed the right wing of Sherman's forces during the celebrated Sherman's March to the Sea and subsequent Carolinas Campaign, engaging Confederate troops at the Battle of Bentonville.

Commanders

The corps had several distinguished commanders throughout its existence. Its first commander was General Ulysses S. Grant, who led it briefly before his promotion. William T. Sherman then commanded the corps during the early stages of the Vicksburg Campaign. The officer most associated with the XV Corps was Major General John A. Logan, a charismatic political general from Illinois who led it with great success during the Atlanta Campaign and beyond. Other commanders included Major General Francis P. Blair Jr., who led the corps during the March to the Sea and in the Carolinas, and Major General Peter J. Osterhaus, a skilled German-born officer.

Notable battles and campaigns

The XV Corps participated in nearly every major operation of the Army of the Tennessee. Its most significant contributions came during the decisive Vicksburg Campaign, where its actions were instrumental in the capture of the Mississippi River fortress. During the Atlanta Campaign, the corps was heavily engaged at the Battle of Dallas, the assault on Kennesaw Mountain, and the capture of Atlanta. In the war's final year, it conducted the destructive March to the Sea from Atlanta to Savannah, and fought its final major battle at Bentonville against the forces of General Joseph E. Johnston.

Legacy and disbandment

The XV Corps was renowned for its endurance, aggressiveness, and strong esprit de corps, symbolized by its official badge: a cartridge box with the motto "40 Rounds." After participating in the Grand Review of the Armies in Washington, D.C., the corps was disbanded in July and August 1865. Its legacy is preserved in numerous memorials, regimental histories, and within the broader historical narrative of the Western Theater, where it is remembered as one of the hardest-fighting Union corps of the entire conflict.

Category:Union Army corps Category:Military units and formations of the American Civil War