- Feb 1 -Feb 8th] Battle of Yazoo River, MS
- Feb 1 Second Schleswig War begins when Prussian and Austrian forces cross into Schleswig challenging Danish control
- Feb 2 -Oct 7th) Cruise of CSS Florida
- Feb 3 Sherman's march through Mississippi
- Feb 4 Skirmish at Big Black River Bridge, Mississippi
- Feb 5 Danish army begins its withdrawal from Danevirke to Dybbøl through driven snow, last time the Danes would occupy Danevirke, symbol of Danish identity
- Feb 5 Federals occupy Jackson, Mississippi
- Feb 6 -7] Skirmish at Barnett's Ford Virginia
- Feb 7 Federal troops occupy Jacksonville, Florida
- Feb 13 Miridian Campaign fighting at Chunky Creek & Wyatt, Mississippi
- Feb 15 Fire in Rotterdam damages Museum Boijmans Van Beuningen
- Feb 16 Battle of Mobile, Alabama - operations by Union Army
- Feb 17 Confederate submarine CSS H.L. Hunley sinks Union ship USS Housatonic at Charleston, South Carolina in the world's first successful submarine attack; crews of both vessels were killed [1]
- Feb 19 Knights of Pythias form 1st lodge in Washington, D.C. (12 members)
- Feb 20 Civil War battle of Olustee, Florida
- Feb 21 -22] Battle at Okolona, Mississippi
- Feb 21 1st US Catholic parish church for black worshippers dedicated in Baltimore
- Feb 22 -27] Battle at Dalton Georgia
- Feb 22 2nd and last day of Battle of Okolona, Mississippi
- Feb 22 Skirmish at Calfkiller Creek (Battle of Dug Hill), Tennessee
- Feb 24 -Feb 25] Battle of Tunnel Hill, GA (Buzzard's Roost)
- Feb 27 6th and last day of battle at Dalton, Georgia (about 600 casualties)
- Feb 27 Near Andersonville, Georgia, rebels open a new POW camp "Camp Sumpter"
- Feb 28 -Mar 3rd] Skirmish at Albemarle County Virginia (Burton's Ford)
- Feb 28 -Mar 4th) Raid at Kilpatrick's Richmond
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