Battle of Fort Sumter
Apr 12 Fort Sumter in South Carolina is attacked by the Confederacy, beginning the American Civil War
Federal Army Mobilized
Apr 15 Federal army of 75,000 volunteers is mobilized by President Abraham Lincoln at the start of the American Civil War
- Apr 16 US President Abraham Lincoln outlaws business with Confederate States (US Civil War)
- Apr 17 Indianola TX - "Star of West" taken by Confederacy
- Apr 17 Virginia secedes from the Union (US Civil War)
Lee Rejects Union Command
Apr 18 Colonel Robert E. Lee turns down offer to command Union armies (US Civil War)
- Apr 19 Baltimore riots - 4 soldiers, 9 civilians killed
- Apr 19 Lincoln orders blockade of Confederate ports (Civil War)
- Apr 23 Arkansas troops seize Fort Smith on the Arkansas River
- Apr 23 Robert E. Lee named commander of Virginia Confederate forces (US Civil War)
- Apr 25 Battle of Lavaca, fought in Texas, Union victory (US Civil War)
- Apr 25 The Union Army arrives to reinforce Washington, D.C. (US Civil War)
Stonewall Jackson Takes Command
Apr 27 Confederate General Robert E. Lee orders Colonel Thomas "Stonewall" Jackson to take command of Harpers Ferry, Virginia [1]
- Apr 27 US President Abraham Lincoln suspends writ of habeas corpus (US Civil War)
- Apr 27 West Virginia secedes from Virginia after Virginia secedes from Union (US Civil War)
- Apr 29 Maryland's House of Delegates votes against seceding from Union (US Civil War)
- Apr 30 US President Abraham Lincoln orders Federal Troops to evacuate Indian Territory (US Civil War)
Admirals
Aviators
Gangsters
Generals
Industrialists
Suffragists