Antietam: 23,000 casualties in one day
The Battle of Antietam on September 17, 1862, produced 23,000 casualties in a single day — the bloodiest single day in American history.
Snapshot · Lex Fridman Podcast
#499 – Gary Gallagher: American Civil War, Slavery, Lincoln, Grant & Lee
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Jul 28, 2026
Where this was said
Key battles of the Civil War
At 2:06:53 · chapter starts 2:00:05
The sequence from First Manassas — watched by Washington picnickers who expected a quick Union victory — through Shiloh in April 1862 to Antietam marks the war's psychological transformation. Shiloh's 25,000 casualties in two days and the Seven Days Battles' 36,000 casualties shattered all prior assumptions about scale. The section traces how McClellan's failure to capture Richmond convinced both Lincoln and Congress that slavery had to become a war aim: if the Confederacy could survive this long with slavery underpinning its economy and mobilization, striking at slavery was a military imperative. Lincoln waited for a Union 'victory' to announce the proclamation; Lee's retreat from Antietam — a battle he survived only by the narrowest margin with 35,000 men against McClellan's 80,000 — provided it. Five days later, on September 22, Lincoln issued the preliminary Emancipation Proclamation.
Shiloh: 25,000 casualties in 2 days
The Battle of Shiloh in April 1862 produced upwards of 25,000 casualties in two days — more than all US battle casualties in every prior war combined.
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