Friday September 20 1861

• Mayfield, KY, is evacuated by the Confederate forces.
• The Maryland political prisoners are sent to Fort Lafayette, NY, while Maryland Governor Thomas H. Hicks, indorses the act of arrest.
• Skirmish opposite Seneca Creek, MD.
• Maj. Gen. Sterling Price, the Missouri State Guard, captures Lexington, MO, and the US forces under the command of Col. James A. Mulligan, of the 23d IL Infantry, after a week long siege. Maj. Gen. John Charles Fremont, USA, is criticized for not sending relief to Col. Mulligan.

Saturday September 20 1862

• Skirmish near Helena, AR.
• Actions near Mumsfordville, KY, with Maj. Gen. Don Carlos Buell, USA, reoccupying the town, as Gen. Braxton Bragg, CSA, moves to Bardstown to effect a hookup with Maj. Gen. E. Kirby Smith, CSA. (Sep 20-21)
• Skirmish near Hagerstown, MD.
• Skirmish near Williamsport, MD.
• Skirmish on the Fulton Road, south of luka, MS.
• Skirmish at Shirley's Ford, Spring River, MO.
• Affair near Shiloh, NC, with the Union landing party from the ironclad, USS Lancer.
• Federal expedition from Bolivar to Grand Junction and La Grange, TN, and skirmish. (Sep 20-22)
• Skirmish at Ashby's Gap, VA.
• Skirmish at Point Pleasant, WV.
• Action near Shepherdstown, WV.

Sunday September 20 1863

• John Bell Hood. C.S.A.. is appointed Lieut. Gen.
• Federal expedition from Paducah, KY, to McLemoresville, TN. (Sep 20-30)
• Skirmish at Morgan's Ferry, on the Atchafalaya, LA.
• Skirmish at Hornersville, MO.
• The Battle of Chickamauga, TN, rages on as the Confederates under Lieut. Gen. James Longstreet, CSA, eventually force a Union retreat toward Chattannooga, TN, by Maj. Gens. Rosecrans, McCook and Crittenden, while Maj. Gen. George H. Thomas, USA, earns his nickname, "The Rock of Chickamauga," as he stubbornly refuses to retreat from his defensive position at Snodgrass Hill, finally withdrawing toward Rossville. Total casualties approximates 34,500.
• Brig. Gen. James Deshler, CSA, is mortally wounded at the Battle of Chickamauga, TN, dying instantly from a federal artillery shell while inspecting his troops prior to an assault on the Federal line.
• Brig. Gen. Benjamin Hardin Helm, CSA, is mortally wounded at the Battle of Chickamauga, TN, while leading his men on an assault on the Federal lines.
• Brig. Gen. William Haines Lytle, USA, is mortally wounded at the Battle of Chickamauga, TN, while leading his men in a charge against the Confederate battle line, to give the retreating Union troops time to escape.
• Skirmishes at Carter's Depot, East TN. (Sep 20-21)
• Action at Zollicoffer, East TN, with Maj. Gen. Ambrose E. Burnside. USA. (Sep 20-21)
• Affair on Shaver Mountain, WV, in the vicinity of Buckhannon and Huttonsville, WV, with casualties.

Tuesday September 20 1864

• Simon Bolivar Buckner. C.S.A.. is appointed Lieut. Gen.
• The following are appointed Confederate Brigadier Generals:
  • Edwin Gray Lee, CSA
  • Patrick Theodore Moore, CSA
  • William Henry Wallace, CSA
• Skirmish at Cartersville, GA.
• Federal raids from Kentucky and East Tennessee into Southwestern Virginia, by Bvt. Maj. Gen. Stephen G. Burbridge, USA, against Maj. Gen. John C. Breckinridge, CSA, commanding the Dept. of Western Virginia and East Tennessee. (Sep 20-Oct 17)
• Skirmish at McCormick's Gap, KY.
• The Union surrender of Keytesville, MO, as Maj. Gen. Sterling Price, CSA, presses on to relieve pressure from Union advances in the south.
• Federal scout in La Fayette County, MO, with skirmish on the Arrow Rock Road with guerrillas (Sep 23). (Sep 20-25)
• Skirmish at Ponder's Mill, Little Black River, MO, with Maj. Gen. Sterling Price, CSA.
• Skirmish near Cedarville, VA, as Union cavalry pursue the fleeing Confederates under Lieut. Gen. Jubal Early, CSA.
• Skirmish at Middleton, VA, the Shenandoah Valley, Campaign.
• Skirmish at Strasburg, VA, the Shenandoah Valley, Campaign.

Wednesday September 20 1865