Major General Henry Wager Halleck
-- chief of all Union armies
-- reporting to Washington command

Major General Joseph Eggleston Johnston
-- commanding the Department of the West
-- reporting to Richmond command

Major General (Hiram) Ulysses S. Grant
-- commanding Department (Army) of the Tennessee
-- reporting to Maj. General Henry Wager Halleck
-- lead "Left Wing" of Army of Tennessee against Vicksburg, December, 1862, via land routes but chose not to engage

Lieutenant General John Clifford Pemberton
-- commanding the Department of Mississippi and East Louisiana
-- reporting to Maj. General Joseph Eggleston Johnston

Major General William Tecumseh Sherman
-- commanding Right Wing, 13th Army Corps (later 15th)
-- reporting to Maj. Gen. Ulysses S. Grant
-- lead Grant's "Right Wing" against Vicksburg in December, 1862, moving his army from Memphis to Vicksburg by steamboats

Major General Martin Luther Smith
-- commanding Second Military District, C. S. A.
-- constructed defenses of Vicksburg
-- captured July 4, 1863 at Vicksburg, later exchanged
-- reporting to (Richmond command?)

Brigadier General Andrew Jackson Smith
-- commanding First Division, Right Wing, 13th Army Corps, Army of the Tennessee; escort Company C, 4th Indiana Cavalry; Chicago Mercantile Battery; 17th Company, Ohio Light Artillery
-- reporting to Maj. Gen. William Tecumseh Sherman

Major General Carter Littlepage Stevenson
-- commanding Second Military District (after M. L. Smith)
-- captured July 4, 1863 at Vicksburg, later paroled

Brigadier General Stephen Gano Burbridge
-- commanding 1st Brigade, First Division, Right Wing, 13th Army Corps, Army of Tennessee; 16th Indiana, 60th Indiana, 67th Indiana, 83rd Ohio, 96th Ohio, 23rd Wisconsin
-- reporting to Brig. Gen. Andrew Jackson Smith

Brigadier General Seth Maxwell Barton
-- commanding Barton's Brigade; 40th Georgia, 42nd Georgia, 43rd Georgia, 52nd Georgia, detachment Botetourt Virginia Artillery
-- captured July 4, 1863 at Vicksburg, later exchanged
-- reporting to Maj. Gen. Martin L. Smith (assumed)

Colonel William Jennings Landram
-- commanding 2nd Brigade, First Division, Right Wing, 13th Army Corps, Army of Tennessee; 77th Illinois, 97th Illinois, 108th Illinois, 131st Illinois, 89th Indiana, 19th Kentucky, 48th Ohio
-- reporting to Brig. Gen. Andrew Jackson Smith

Brigadier General John C. Vaughn
-- commanding Vaughn's Brigade; 60th Tennessee, 61st Tennessee, 62nd Tennessee
-- captured July 4, 1863 at Vicksburg, later paroled
-- reporting to Maj. Gen. Martin L. Smith (assumed)

Brigadier General Morgan Lewis Smith
-- commanding Second Division, Right Wing, 13th Army Corps, Army of the Tennessee; two brigades, Co. A, 1st Illinois Light Artillery; Co. B, 1st Illinois Light Artillery; Section, Co. H, 1st Illinois Light Artillery
-- reporting to Maj. Gen. William Tecumseh Sherman
-- severely wounded at battle of Chickasaw Bayou

Brigadier General John Gregg
-- commanding Gregg's Brigade (10th Brigade, First Division, Army of Mississippi)
-- 3rd Tennessee, 10th Tennessee, 30th Tennessee, 41st Tennessee, 50th Tennessee, 1st Tennessee Infantry Battalion
-- reporting to Maj. Gen. Martin L. Smith (assumed)
-- killed in 1864 at Battle of Richmond

Colonel Giles Smith
-- commanding 1st Brigade, Second Division, Right Wing, 13th Army Corps, Army of Tennessee; 113th Illinois, 116th Illinois, 6th Missouri, 8th Missouri, 13th U. S. Infantry (1st Battalion)
-- reporting to Brig. Gen. Morgan L. Smith

Brigadier General Stephen Dill Lee
-- commanding Provisional Division (three brigades)
--captured July 4, 1863 at Vicksburg, later paroled
-- reporting to Maj. Gen. Martin L. Smith (assumed)

Brigadier General David Stuart
-- commanding 4th Brigade, Second Division, Right Wing, 13th Army Corps, Army of Tennessee; 55th Illinois, 127th Illinois, 83rd Indiana, 54th Ohio, 57th Ohio; may have assumed command of Second Division
-- reporting to Brig. Gen. Morgan L. Smith

Colonel William T. Withers
-- commanding one of three Provisional Brigades consisting of some of the following: 17th Louisiana, 22nd Louisiana, 26th Louisiana, 29th Louisiana, 31st Louisiana, 3rd Mississippi, Companies A, D, E, G, I, L 1st Mississippi Light Artillery, Company A 14th Mississippi Light Artillery, Company I 28th Mississippi Cavalry, Hill's Partisan Ranger Company
-- reporting to Brig. Gen. Stephen Dill Lee
-- survived war

Brigadier General George Washington Morgan
-- commanding Third Division, Right Wing, 13th Army Corps, Army of Tennessee; three brigades, 7th Company, Michigan Light Artillery; 1st Company, Wisconsin Light Artillery, Kentucky Company of Pioneers and Mechanics
-- reporting to Maj. Gen.William Tecumseh Sherman

Colonel Allen Thomas
-- commanding one of three Provisional Brigades consisting of some of the following: 17th Louisiana, 22nd Louisiana, 26th Louisiana, 29th Louisiana, 31st Louisiana, 3rd Mississippi, Companies A, D, E, G, I, L 1st Mississippi Light Artillery, Company A 14th Mississippi Light Artillery, Company I 28th Mississippi Cavalry, Hill's Partisan Ranger Company
-- reporting to Brig. Gen. Stephen Dill Lee
-- captured July 4, 1863 at Vicksburg, later exchanged

Colonel Lionel Allen Sheldon
-- commanding 1st Brigade, Third Division, Right Wing, 13th Army Corps, Army of Tennessee; 118th Illinois, 69th Indiana, 120th Ohio
-- reporting to Brig. Gen. George Washington Morgan

Colonel Edward Higgins
-- commanding one of three Provisional Brigades consisting of some of the following: 17th Louisiana, 22nd Louisiana, 26th Louisiana, 29th Louisiana, 31st Louisiana, 3rd Mississippi, Companies A, D, E, G, I, L 1st Mississippi Light Artillery, Company A 14th Mississippi Light Artillery, Company I 28th Mississippi Cavalry, Hill's Partisan Ranger Company
-- reporting to Brig. Gen. Stephen Dill Lee
-- captured July 4, 1863 at Vicksburg, later exchanged

Colonel Daniel Weisiger Lindsey
-- commanding 2nd Brigade, Third Division, Right Wing, 13th Army Corps, Army of Tennessee; 49th Indiana, 7th Kentucky, 114th Ohio
-- reporting to Brig. Gen. George Washington Morgan

Colonel Wirt Adams
-- commanding Wirt Adams Cavalry Regiment (unattached)
-- reporting to (?)

Col. John Fitzroy DeCourcy
-- commanding 3rd Brigade, Third Division, Right Wing, 13th Army Corps, Army of Tennessee; 54th Indiana, 22nd Kentucky, 16th Ohio, 42nd Ohio
-- reporting to Brig. Gen. George Washington Morgan

General Edward Dorr Tracy
-- commanding Tracy's Brigade; 20th Alabama, 23rd Alabama, 30th Alabama, 31st Alabama
-- reporting to (?)
-- arrived evening of December 29 as reinforcment to Vicksburg

Brigadier General Frederick Steele
-- commanding Fourth Division, Right Wing, 13th Army Corps, Army of Tennessee; three brigades, 6th Missouri Cavalry, 3rd Illinois Cavalry, Companies A & B of Thielemann's Independent Cavalry Battalion
-- reporting to Maj. Gen.William Tecumseh Sherman

Major General Dabney H. Maury
-- commanding Maury's Division; one brigade (Heberts)
-- reporting to (?)

Brigadier General Francis (Frank) Preston Blair, Jr.
-- commanding 1st Brigade, Fourth Division, Right Wing, 13th Army Corps, Army of Tennessee; 13th Illinois, 29th Missouri, 30th Missouri, 31st Missouri, 32nd Missouri, 58th Ohio, 4th Company Ohio Light Artillery, Company C 10th Missouri Cavalry
-- reporting to Brig. Gen. Frederick Steele

Brigadier General Louis Hebert
-- commanding Hebert's Brigade; 3rd Louisiana, 21st Louisiana, 36th Mississippi, 37th Mississippi, 38th Mississippi, 43rd Mississippi, 7th Mississippi Infantry Battalion, Company H 1st Mississippi Light Artillery, Tobin's Tennessee Battery
-- reporting to Maj. Gen. Dabney H. Maury (assumed)
-- arrived at Snyder's Bluff on January 1, 1863

Brigadier General Charles Edward Hovey
-- commanding 2nd Brigade, Fourth Division, Right Wing, 13th Army Corps, Army of Tennessee; 25th Iowa, 31st Iowa, 3rd Missouri, 12th Missouri, 17th Missouri, 76th Ohio, Co. F 2nd Missouri Light Artillery
-- reporting to Brig. Gen. Frederick Steele

General John Creed Moore
-- commanding Moore's Brigade; 37th Alabama, 42nd Alabama, 35th Mississippi, 40th Mississippi, 2nd Texas
-- reporting to (?)
-- began arriving afternoon of December 30, 1862

Brigadier General John Milton Thayer
-- commanding 3rd Brigade, Fourth Division, Right Wing, 13th Army Corps, Army of Tennessee; 4th Iowa, 9th Iowa, 26th Iowa, 28th Iowa, 30th Iowa, 34th Iowa, 1st Company Iowa Light Artillery
-- reporting to Brig. Gen. Frederick Steele

Rear Admiral David Dixon Porter
-- commanding Mississippi River Squadron
-- transported Gen. Sherman's amphibous strike force from Memphis to the Yazoo River, near Vicksburg, Mississippi
-- performed significant naval operations, clearing rivers of mines and torpedos, guarding troops with gunboats
-- reporting to Washington command (?); worked in concert with generals Ulysses Grant, William Sherman in Vicksburg campaigns