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On November 1, 1861, Major General George B. McClellan issued General Orders, No. 19 (Headquarters of the Army) announcing that he was assuming command of the Armies of the United States.

On May 9, 1861, the US Department of War issued General Orders, No. 19, altering the boundaries of the Department of the Ohio.

On May 7, 1864, the U.S. War Department issued General Orders No. 192, creating the Division of West Mississippi, Edward Canby commanding.

On June 27, 1863, the U.S. War Department issued General Orders No. 194 replacing Joseph Hooker with George G. Meade as commander of the Army of the Potomac.

On May 16, 1864, the U.S War Department issued General Orders, No. 119, announcing that Major General Horatio G. Wright, U.S. Volunteers, was assigned to the command of 6th Army Corps.

On October 19, 1863, Ulysses S. Grant issued General Orders No. 2, naming William T. Sherman to succeed him as commander of the Department and Army of the Tennessee.

On January 7, 1862, Major General George B. McClellan issued General Orders, No. 2 creating the Department of North Carolina and naming Brigadier General Ambrose E. Burnside as commander.

On June 20, 1861, Brigadier General P. G. T. Beauregard issued General Orders, No. 20 referring, for the first time, to the troops under his command as the Army of the Potomac.

On February 23, 1862, Major General George B. McClellan issued General Orders No. 20 (Dept. of the Army) creating the Department of the Gulf and naming Major General Benjamin F. Butler to command.

On January 25, 1863, the U.S. War Department issued General Order 20, relieving Ambrose E. Burnside as commander of the Army of the Potomac and replacing him with Joseph Hooker.

On May 19, 1864, the U.S. War Department issued General Orders, No. 200 announcing that Major General David Hunter was replacing Major General Franz Sigel as commander of the Department of West Virginia.

On May 21, 1864, the U.S. War Department issued General Orders, No. 201, assigning Major General Irvin McDowell, to the command of the Department of the Pacific.

On May 27, 1864, the U.S. War Department issued General Orders, No. 203 ordering all officers in the Military Division of West Mississippi to obey the orders of Major General Edward Canby.

On December 17, 1862, the U.S. War Department issued General Orders, No. 207, appointing Major General Robert. C. Schenck to command the Middle Department and the 8th Army Corps.

On December 18, 1862, the U.S. War Department issued General Orders No. 210, creating four Army Corps from troops operating in Missouri or near the Mississippi River.

On July 10, 1863, the U.S. War Department issued General Orders, No. 214, announcing that Major General Edward O. C. Ord had replaced Major General John A. McClernand as commander of the 13th Army Corps.

On July 15, 1863, the U.S. War Department issued General Orders, No. 217, announcing that the Departments of Virginia and North Carolina had been merged under the command of Major General John G. Foster.

On July 16, 1863, the U.S. War Department issued General Orders, No. 218 announcing that Brigadier General Quincy A. Gillmore had replaced Major General David Hunter as commander of the 10th Army Corps.

On July 5, 1862, Confederate General Braxton Bragg issued General Orders, No. 22, relinquishing command of the Army of the Mississippi to Major General William J. Hardee.

On July 7, 1864, the U.S. War Department issued General Order No. 225 reorganizing the 18th Army Corps and reaffirming William F. "Baldy" Smith as corps commander. Ten days later, Ulysses S. Grant sacked Smith for no stated reason.