Tubman Frees Slaves
Jun 2 Harriet Tubman leads Union guerrillas into Maryland, freeing slaves
Battle of Milliken's Bend
Jun 7 Battle of Milliken's Bend, Lousisiana, Jefferson Davis' home burnt
- Jun 7 Mexico City captured by French troops
- Jun 9 Battle of Brandy Station, Virginia (Fleetwood, Beverly Ford)
Battle of Brice's Crossroads
Jun 10 Battle of Brice's Crossroads, Mississippi; 3,500 troops led by Confederate Nathan Bedford Forrest defeats a Federal force of 8000
- Jun 13 Samuel Butler publishes 1st part of "Erewhon" in Christchurch, New Zealand
- Jun 13 Second Battle of Winchester, Virginia
- Jun 13 Skirmish at Berryville, Virginia
- Jun 14 Battle of 2nd Winchester, Virginia; Confederate force defeats Union army garrison and captures Winchester
- Jun 15 Second Battle at Winchester Virginia, ends in Federal defeat; 1350 casualties
- Jun 17 Battle at Middleburg, Virginia - 1st Rhode Island Cavalry routed trying to take the town
- Jun 17 Battle of Aldie, Confederates fail to drive back Union in Virginia
- Jun 17 Naval Engagement at Warsaw Sound GA-USS Weehawken vs CSS Atlanta
- Jun 17 Travelers Insurance Co of Hartford chartered (1st accident insurer)
- Jun 18 After long neglect, Confederates hurriedly fortify Vicksburg
- Jun 19 Battle at Middleburg, Virginia, with 100+ casualties
- Jun 20 1st bank chartered in US (National Bank of Davenport Iowa)
- Jun 20 Skirmish at Greencastle, Pennsylvania
- Jun 20 West Virginia admitted as 35th US state of the Union
- Jun 21 Battle at Upperville, Virginia, Union forces hold off Confederate advance, 389 causalities
- Jun 23 Tullahoma campaign, Tennessee
- Jun 24 Planning an invasion of Pennsylvania, Lee's army crosses Potomac
- Jun 25 US General George Meade replaces General Hooker to be more aggressive
- Jun 27 Skirmish at Fairfax Courthouse, Virginia
- Jun 28 American Civil War: Second Battle of Donaldsonville, Louisiana - Union forces successfully repel Confederate attack on Fort Butler, on the Mississippi River
- Jun 29 Battle at Westminster or Corbitt's Charge, Maryland: small unit of Delaware cavalry charge Confederate cavalry numbering nearly 6,000, crucially delaying their arrival at Gettysburg
- Jun 29 Confederate General Robert Lee orders his forces to concentrate near Gettysburg, Pennsylvania
Custer Appointed General
Jun 29 George Armstrong Custer, aged 23, appointed Union Brigadier General
- Jun 29 Very 1st First National Bank opens in Davenport, Iowa
- Jun 30 Battles in Hanover, Pennsylvania: 80 casualties
- Jun 30 Dutch colony Suriname counts population of 33,000 slaves
- Jun 30 Skirmish at Sporting Hill, Pennsylvania