21st January » The Tauranga Campaign begins during the Maori Wars.
17th February » American Civil War: The Ship H. L. Hunley submarine 6 becomes the first submarine to Sinking of USS Housatonic engage and sink a warship, the USS Housatonic 1861 6.
20th February » American Civil War: Battle of Olustee occurs the largest battle fought in Florida during the war.
27th February » American Civil War: The first Union (American Civil War) known as Northern prisoners arrive at the Confederate States of America called Confederate prison at Andersonville, Georgia.
29th February » American Civil War: Kilpatrick-Dahlgren Raid fails plans to free 15,000 United States named Union soldiers being held near Richmond, Virginia are thwarted.
11th March » The Great Sheffield Flood kills 238 people in Sheffield, England.
12th March » American Civil War: The Red River Campaign begins as a US Navy fleet of 13 Ironclads and 7 Gunboats and other support ships enter the Red River.
15th March » American Civil War: The Red River Campaign : U.S. Navy fleet arrives at Alexandria, Louisiana.
16th March » American Civil War: During the Red River Campaign, Union (American Civil War) known as Union troops reach Alexandria, Louisiana.
8th April » American Civil War: Battle of Mansfield Union (American Civil War) called Union forces are thwarted by the Confederate States of America e.g Confederate army at Mansfield, Louisiana.
10th April » Archduke maximilian I of Mexico known as Maximilian of Habsburg is proclaimed emperor of Mexico during the French intervention in Mexico.
12th April » American Civil War: The Fort Pillow massacre: Confederate forces kill most of the African American soldiers that surrendered at Fort Pillow, Tennessee.
17th April » American Civil War: The Battle of Plymouth (1864) named Battle of Plymouth begins – Confederate States of America or Confederate forces attack Plymouth, North Carolina.
18th April » Battle of Dybbøl: A Kingdom of Prussia Prussian-Austrian Empire Austrian army defeats Denmark and gains control of Duchy of Schleswig Schleswig. Denmark surrenders the province in the following peace settlement.
22nd April » The Congress of the United States called U.S. Congress passes the Coinage Act of 1864 that mandates that the inscription 'In God We Trust' be placed on all coins minted as United States currency.
29th April » Theta Xi fraternity is founded at Rensselaer Polytechnic Institute, the only fraternity to be founded during the American Civil War.
5th May » American Civil War: The Battle of the Wilderness begins in Spotsylvania County, Virginia or Spotsylvania County.
7th May » American Civil War: The Army of the Potomac, under General Ulysses S. Grant, breaks off from the Battle of the Wilderness and moves southwards.
9th May » Second War of Schleswig: The Denmark Danish navy defeats the Austrian Empire Austrian and Kingdom of Prussia Prussian fleets in the Battle of Heligoland (1864) Battle of Heligoland.
10th May » American Civil War: Colonel Emory Upton leads a 10-regiment "Attack-in-depth" assault against the Confederate works at The Battle of Spotsylvania, which, though ultimately unsuccessful, would provide the idea for the massive Benjamin T. Brockman Battle of
12th May » American Civil War: The Battle of Spotsylvania Court House: Thousands of Union and Confederate soldiers die in "the Bloody Angle".
13th May » American Civil War: Battle of Resaca the battle begins with Union (American Civil War) or Union General William Tecumseh Sherman or Sherman fighting toward Atlanta, Georgia.
15th May » American Civil War: Battle of Resaca, Georgia (U.S. state) called Georgia ends.
15th May » American Civil War: Battle of New Market, Virginia: Students from the Virginia Military Institute fight alongside the Confederate States of America known as Confederate Army to force Union (American Civil War) e.g Union General Franz Sigel out of the Shen
20th May » American Civil War: Battle of Ware Bottom Church in the Virginia Bermuda Hundred Campaign, 10,000 troops fight in this Confederate victory.
21st May » Russia declares an end to the Russian–Circassian War and many Circassians are forced into exile. The day is designated the Circassian Day of Mourning.
21st May » American Civil War: the Battle of Spotsylvania Court House ends.
26th May » Montana is organized as a Political divisions of the United States called United States territory.
29th May » Emperor of Mexico named Emperor Maximilian I of Mexico arrives in Mexico for the first time.
31st May » American Civil War Overland Campaign: Battle of Cold Harbor The Army of Northern Virginia under Robert E. Lee engages the Army of the Potomac under Ulysses S. Grant and George Meade.
3rd June » American Civil War: Battle of Cold Harbor Union forces attack Confederate troops in Hanover County, Virginia.
5th June » American Civil War: Battle of Piedmont: Union (American Civil War) Union forces under General David Hunter defeat a Confederate States of America Confederate army at Piedmont, Augusta County, Virginia Piedmont, Virginia, taking nearly 1,000 prisoners.
12th June » American Civil War, Overland Campaign: Battle of Cold Harbor Ulysses S. Grant gives the Confederate forces under Robert E. Lee a victory when he pulls his Union troops from their positions at Cold Harbor, Virginia and moves south.
15th June » American Civil War: The Second Battle of Petersburg begins.
15th June » Arlington National Cemetery is established when convert 200 acre km² around Arlington Mansion (formerly owned by Confederate General Robert E. Lee) are officially set aside as a military cemetery by United States Secretary of War U.S. Secretary of War Edw
21st June » American Civil War: The Battle of Jerusalem Plank Road begins.
21st June » New Zealand land wars known as New Zealand Land Wars: The Tauranga Campaign ends.
30th June » President of the United States or U.S. President Abraham Lincoln grants Yosemite Valley to California for "public use, resort and recreation".
11th July » American Civil War: Battle of Fort Stevens; Confederate States of America named Confederate forces attempt to invade Washington, D.C.
19th July » Taiping Rebellion: Third Battle of Nanking The Qing dynasty finally defeats the Taiping Heavenly Kingdom.
20th July » American Civil War: Battle of Peachtree Creek Near Atlanta Atlanta, Georgia, Confederate States of America Confederate forces led by General John Bell Hood unsuccessfully attack Union (American Civil War) Union Union Army troops under General William T. S
22nd July » American Civil War: Battle of Atlanta Outside Atlanta, Georgia, Confederate States of America named Confederate General John Bell Hood leads an unsuccessful attack on United States e.g Union troops under General William T. Sherman on Bald Hill.
24th July » American Civil War: Second Battle of Kernstown Battle of Kernstown Confederate States of America Confederate General officer General Jubal Early defeats Union (American Civil War) Union troops led by General George Crook in an effort to keep them out of t
28th July » American Civil War: Battle of Ezra Church Confederate States of America Confederate troops make a third unsuccessful attempt to drive Union (American Civil War) Union forces from Atlanta Atlanta, Georgia.
29th July » American Civil War: Confederate States of America e.g Confederate spy Belle Boyd is arrested by Union (American Civil War) named Union troops and detained at the Old Capitol Prison in Washington, D.C.
30th July » American Civil War: Battle of the Crater Union (American Civil War) Union forces attempt to break Confederate States of America Confederate lines at Siege of Petersburg Petersburg, Virginia by exploding a large bomb under their trenches.
5th August » American Civil War: The Battle of Mobile Bay begins at Mobile Bay near Mobile, Alabama, Admiral David Farragut leads a Union flotilla through Confederate defenses and seals one of the last major Southern ports.
17th August » American Civil War: Battle of Gainesville – Confederate forces defeat Union troops near Gainesville, Florida.
18th August » American Civil War: Battle of Globe Tavern – Union (American Civil War) e.g Union forces try to cut a vital Confederate States of America or Confederate supply-line into Petersburg, Virginia, by attacking the Wilmington and Weldon Railroad.
22nd August » Twelve nations sign the First Geneva Conventions known as Geneva Convention.
23rd August » The Union Navy Siege of Fort Morgan captures Fort Morgan (Alabama) Fort Morgan, Alabama, thus breaking Confederate States of America Confederate dominance of all ports on the Gulf of Mexico except Galveston, Texas.
31st August » During the American Civil War, United States e.g Union forces led by General William T. Sherman launch an Battle of Jonesborough called assault on Atlanta, Georgia.
1st September » American Civil War: the Confederate Army General John Bell Hood orders the evacuation of Atlanta, ending a four-month siege by General William Tecumseh Sherman.
2nd September » American Civil War: Union forces enter Atlanta called Atlanta, Georgia, a day after the Confederate States of America e.g Confederate defenders flee the city, ending the Atlanta Campaign.
5th September » François Achille Bazaine becomes Marshal of France.
7th September » American Civil War: Atlanta, is evacuated on orders of Union (American Civil War) e.g Union General William Tecumseh Sherman.
2nd October » American Civil War: First Battle of Saltville Battle of Saltville United States Union forces attack Saltville, Virginia, but are defeated by Confederate States of America Confederate troops.
5th October » The Indian city of Kolkata named Calcutta is almost totally destroyed by a cyclone; 60,000 die.
7th October » American Civil War Bahia Incident: USS Wachusett (1861) USS 'Wachusett' illegally captures the Ship CSS Florida cruiser 6 Confederate raider while in port in Bahia, Brazil in violation of Brazilian neutrality.
11th October » Campina Grande, Brazil is established as a city.
15th October » American Civil War: The Battle of Glasgow is fought, resulting in the surrender of Glasgow, Missouri, and its Union garrison, to the Confederate States of America or Confederacy.
19th October » Battle of Cedar Creek Union Army under Philip Sheridan destroys a Confederate Army under Jubal Anderson Early or Jubal Early.
19th October » St. Albans Raid Confederate States of America named Confederate raiders launch an attack on Saint Albans, Vermont from Canada.
23rd October » American Civil War: Battle of Westport United States Union forces under General Samuel R. Curtis defeat Confederate States of America Confederate troops led by General Sterling Price at Westport, Kansas City Westport, near Kansas City, Missouri Kansas Cit
28th October » American Civil War: The Battle of Fair Oaks & Darbytown Road (also known as the Second Battle of Fair Oaks) ends Union Army or Union forces under General Ulysses S. Grant withdraw from Fair Oaks, Virginia, after failing to breach the Confederate States of
30th October » Second Schleswig War ends. Denmark renounces all claim to Schleswig, Holstein and Lauenburg, which come under Prussian and Austrian administration.
30th October » Helena, Montana is founded after four Prospecting known as prospectors discover gold at "Last Chance Gulch".
31st October » Nevada is admitted as the 36th U.S. state.
4th November » American Civil War: Battle of Johnsonville Confederate States of America known as Confederate troops bombard a United States called Union supply base and destroy millions of dollars in material.
13th November » The new Greek Constitution of 1864 e.g Constitution of Greece is adopted.
25th November » American Civil War: A group of Confederate operatives calling themselves the Confederate Army of Manhattan starts fires in more than 20 locations in an unsuccessful attempt to burn down New York City.
29th November » American Indian Wars: Sand Creek Massacre Colorado volunteers led by Colonel John Chivington massacre at least 150 Cheyenne and Arapaho noncombatants inside Colorado Territory.
29th November » American Civil War: Battle of Spring Hill A Confederate States Army known as Confederate advance into Tennessee misses an opportunity to crush the Union Army. General John Bell Hood is angered, which leads to the Second Battle of Franklin called Battle of
30th November » American Civil War: Battle of Franklin II known as Battle of Franklin The Confederate Army of Tennessee led by General John Bell Hood mounts a dramatically unsuccessful frontal assault on United States e.g Union positions commanded by John McAllister Scho
15th December » American Civil War: Battle of Nashville Union (American Civil War) Union forces under George Henry Thomas George Thomas almost completely destroy the Army of Tennessee under John Bell Hood John Hood.