Friday September 13 1861

• The Siege of Lexington, MO, by Brig. Gen. Sterling Price, CSA. (Sep 13-20)
• Action at Booneville, MO, with Col. Jefferson C. Davis, 22nd IN.
• Col. Benjamin L. Beall, 1st US Dragoons, assumes the command of the District of Oregon.

Saturday September 13 1862

• Calvin Edward Pratt, USA, is appointed Brig. Gen.
• Federal expedition to Pass Manchac and Ponchatoula, LA, and skirmish, as the Federals burn telegraph and post offices there. (Sep 13-15)
• Skirmishes at Catoctin Mountain, Middletown, Jefferson, and South Mountain, MD.
• Skirmish near Bragg's Farm, near Whaley's Mill, MO.
• Skirmish at Newtonia, MO.
• Skirmish on Strother Fork of the Black River, Iron County, MO.
• Skirmish near luka, MS, with Confederate Cavalry.
• Operations at Flour Bluffs, TX. (Sep 13-14)
• Gen. Robert E. Lee's Special Order No. 191, which details Lee's offensive strategy, is found by Union soldiers, VA, which gives Maj. Gen. George B. McClellan a decisive edge in the campaign at Antietam, MD.
• Maj. Gen. John Sedgwick, USA, is assigned to command of the 12th Corps, Army of the Potomac.
• Action at, and evacuation of, Charleston, WV, by Union forces, due to the forces under Maj. Gen. William W. Loring, CSA.

Sunday September 13 1863

• Federal reconnaissance from Henderson's Gap, AL, to La Fayette, GA, and skirmish, the Chickamauga Campaign.
• Federal reconnaissance from Lee and Gordon's Mills toward La Fayette, GA, and skirmish, the Chickamauga Campaign.
• Skirmish near Summerville, GA, the Chickamauga Campaign.
• Federal expedition from Fort Lamed, KS, to Booth's Ranch, on the Arkansas River, KS.
• Federal scouting near Lake Ponchartrain, LA. (Sep 13-Oct 2)
• Maj. Gen. Ulysses S. Grant, USA, commanding the Army of the Tennessee, is ordered to send all of his available forces to Corinth and Tuscumbia, MS, to support Maj. Gen. Rosecrans, USA, on the Tennessee River.
• Guerrilla attack on, and skirmish near, Salem, MO.
• The capture of the Union telegraph party near Lowndes' Mill, Combahee River, SC, as the Confederates use Negro dogs to track and capture some of the Union soldiers and Negroes who aided them. (Sep 13-14)
• Skirmish at Paris, TN.
• The advance of the Union forces from the Rappahannock to the Rapidan River, VA, as Gen. Robert E. Lee, CSA, withdraws across the Rapidan River, from Culpeper to Orange, VA, due to the weakening of his command with the transfer of Lieut. Gen. James Longstreet's command to Tennessee, to bolster Gen. Braxton Bragg, CSA, with the following skirmishes: (Sep 13-17)
• Skirmishes at Brandy Station, Muddy Run, Culpeper Court-House, Pony Mountain, and Stevensburg, VA.
• Maj. Gen. Henry W. Slocum, USA, resumes the command of the 12th US Army Corps, the Army of the Potomac, VA.
• Confederates scout in West Virginia.

Tuesday September 13 1864

• Joseph Roswell Hawley, USA, is appointed Brig. Gen.
• William Henry Seward, Jr., USA, is appointed Brig. Gen.
• Skirmish near Searcy, AR, as the Rebels attack and wound every Yankee sent out with dispatches. (4)
• Federal expedition from Morganza to Fausse River, LA, with skirmishes:
  • near Bayou Maringouin (Sep 13)
  • near Rosedale (Sep 15) and
  • near Bayou Maringouin (Sep 16).
    (Sep 13-17)
• Skirmish at Longwood, MO, with guerrillas.
• Skirmish at Abraham's Creek, near Winchester, VA, with Early and Sheridan.
• Affair near Berryville, VA.
• Skirmish at Gilbert's Ford, Opequon Creek, VA.
• Affair at Locke's Ford, Opequon Creek, VA.
• Federal scout to Poplar Spring Church, VA, the Richmond, VA, Campaign.
• Skirmish at Bunker Hill, WV.

Wednesday September 13 1865