Battle of Antietam | Summary & Significance | Britannica
https://www.britannica.com/event/Battle-of-Antietam
Battle of Antietam, also called Battle of Sharpsburg, (September 17, 1862), in the American Civil War (1861–65), a decisive engagement that halted the Confederate invasion of Maryland, an advance that was regarded as one of the greatest Confederate threats to Washington, D.C. The Union name for the battle is derived from Antietam Creek, which flows south from Gettysburg, Pennsylvania, to the ...
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