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At the conclusion of the Civil War, at the direction of President Andrew Johnson, the U.S. War Department issued General Orders No. 118 on June 27, 1865, which divided the United States into military districts and divisions.

On March 17, 1864, Lieutenant-General Ulysses S. Grant issued General Orders No. 12, taking command of the armies of the United States, as authorized by President Abraham Lincoln.

On May 13, 1863, the U.S, War Department issued General Orders, No 121, naming Major General John M. Schofield as commander of the Department of the Missouri.

On September 2, 1862, the U.S. War Department issued General Orders, No. 122, announcing that Major General George B. McClellan was given command of all troops for the defense of the capital.

On September 7, 1862, the U.S. War Department issued General Orders, 128, announcing that Major General John Pope had been transferred to command of the Department of the Northwest, as of September 6, 1862. 

On September 12, 1862, the U.S. War Department issued General Orders, No. 129, ending the existence of the Army of Virginia and establishing the status of the twelve existing army corps at that time.

On May 10, 1861, Major General Robert E. Lee issued General Orders, No. 13, announcing that he had been ordered to assume the control of the forces of the Confederate States in Virginia.

On February 2, 1863, the U.S. War Department issued General Orders, No. 134 placing Major General Samuel P. Heintzelman in command of the newly created Department of Washington.

Issued by the U.S. War Department on September 19, 1862, General Orders No. 135 attached Western Virginia to the Department of the Ohio, and named Samuel R. Curtis as commander of the newly created Department of the Missouri.

On March 13, 1862, Confederate Secretary of War Judah P. Benjamin issued General Orders, No. 14, announcing that Jefferson Davis had appointed Robert E. Lee as his adviser for "conduct of military operations in the armies of the Confederacy."

Issued by the U.S. War Department on May 3, 1861, General Orders No. 14 created the Department of the Ohio.

On November 7, 1862, Confederate General Braxton Bragg issued General Orders, No. 143, resuming his command of the Army of the Mississippi.

On April 4, 1864, the U.S. War Department issued General Orders, No. 144, announcing several major changes to the U.S. Army corps command structure as ordered by President Abraham Lincoln.

On October 22, 1861, the Confederate War Department issued General Orders, No. 15 creating the Department of Northern Virginia, commanded by General Joseph E. Johnston.

On August 17, 1861, Lieutenant General Winfield Scott issued General Orders, No. 15 (Headquarters of the Army) announcing the creation of the Department of the Potomac commanded by Major General George B. McClellan.

On November 20, 1862, Confederate General Braxton Bragg issued General Orders, No. 151, re-designating the Army of the Mississippi as the Army of Tennessee.

On October 16, 1862, the U.S. War Department created the Department of the Tennessee and placed Ulysses S. Grant in charge of the new department.

Issued by the U.S. War Department on October 24, 1862, General Orders Number 168, reestablished the Department of the Cumberland and created the 14th Army Corps, which was also known as the Army of the Ohio.

On January 30, 1862, General Joseph E. Johnston issued General Orders, No. 17, announcing that General P. G. T. Beauregard had been transferred out of the Department of Northern Virginia.

On January 12, 1864, the U.S. War Department issued General Orders, No. 17, placing Major General Samuel P. Heintzelman in charge of the newly created Northern Department.