Saturday October 12 1861

• John Porter McCown, CSA, is appointed Brig. Gen.
• Skirmish near Upton's Hill, KY.
• Naval encounter near New Orleans, LA, between the USS Richmond, USS Vincennes and the CSS Manassas, with the two Union vessels retreating, and subsequent action at Bayles' Cross Roads, LA.
• The Union's 1st ironclad, the St. Louis, is launched at Carondelet, MO.
• Skirmishes near Clintonville and on the Pomme de Terro, or Cameron, MO, after Maj. Gen. John C. Fremont, USA, advances from St. Louis, MO, to avoid further criticism for his inactivity while the Confederates operate in the area. (Oct 12-13)
• Operations about Ironton and Fredericktown, MO, with the advance of Merriwether Jeff Thompson's, Confederate Partisan forces from Stoddard County, MO; Thompson being the ex-mayor of St. Louis, and commanding his own independent command.
• Confederate Commissioners to France and Great Britain, Msrs. John Slidell and James Mason, slip through the Union blockade of Charleston, SC, aboard the Theodora, which is bound for Cuba en route for Europe.

Sunday October 12 1862

• Federal expedition from Ozark, MO, toward Yellville, AR. (Oct 12-19)
• Skirmish at Dick's Ford, KY.
• Skirmish near the mouth of the Monocacy, MD, as Maj. Gen. JEB Stuart, CSA, crosses the Potomac near Poolesville, and returning to Virginia.
• Skirmish at White's Ford, MD, with Maj. Gen. JEB Stuart, CSA.
• Skirmish near Arrow Rock, MO, with a guerrilla ambush on the Federal troops there.
• Maj. Gen. Earl Van Dorn, CSA, assumes the command of all the troops in the State of Mississippi.

Monday October 12 1863

• Skirmish at Buckhorn Tavern, near New Market, AL, with Maj. Gen. Joseph Wheeler's, CSA, Confederate Cavalry.
• The attack on the Confederate blockade runner under the walls of Fort Morgan, AL. by the US gunboat, Kanawha, Lieut. Commander W. K. Mayo, and the US tender, Eugenie, Lieut. H. W. Miller.
• Skirmish at Tulip, AR.
• Federal scout from Fort Garland, the Colorado Territory, and the killing of the outlaw Espanoza.
• Skirmish at Webber's Falls, the Indian Territory.
• Skirmish at West Liberty, KY, the East TN Campaign.
• Skirmish at Ingram's Mill, and Wyatt's, near Byhalia, MS.
• Skirmish at Quinn and Jackson's Mill, MS, with Brig. Gen. J. Ronald Chalmers, CSA.
• Skirmishes at Merrill's Crossing to Lamine Crossing, and Dug Ford, near Jonesborough, MO, with Col. Joseph O. Shelby, CSA.
• Federal scout from Vienna through Thornton, Hendrick's (Herndon) Station, Frying Pan, to Gum Springs, VA, in search of Maj. John S. Mosby, CSA, who had gone toward Fairfax Court- House. (Oct 12-13)
• Skirmish at Brandy Station, or Fleetwood, VA, Gen. Robert E. Lee, CSA, the Bristoe Campaign.
• Skirmish at Hartwood Church, VA.
  Skirmishes at Jeffersonton and Games' Cross-Roads, VA.
• Action at Warrenton, or Sulphur Springs, VA.

Wednesday October 12 1864

• Skirmishes on the Coosaville road, near Rome, GA, as Maj. Gen. William T. Sherman, USA, edges closer to Lieut. Gen. John Bell Hood, CSA. (Oct 12-13)
• Skirmish at La Fayette, GA.
• Skirmishes at Resaca, GA.
• The Indian attack on the Overland Stage Coach at Freeman's Ranch, near Plum Creek, the Nebraska Territory.
• Rear Admiral David D. Porter, USN, relieves Rear Admiral Samuel P. Lee, USN, as commander of the North Atlantic Blockading Squadron, off Wilmington, NC.
• Skirmish at Greeneville, TN, as the Federal raids from Kentucky and East Tennessee into southwestern Virginia, under Bvt. Maj. Gen. Stephen A. Burbridge, USA, are concluded.
• Chief Justice of the United States, Roger Brooke Taney, dies at the age of 89, in Washington, DC.

Thursday October 12 1865