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The bloodiest day in American history was August 6, 1945 at Hiroshima, Japan. Over 70,000 people died immediately on impact of "Little Boy", the first atom bomb. Nearly twice that number died later due to the after effects. The second bloodiest day was August 9th, 1945 at Nagasaki, Japan, where between 45,000 and 75,000 people were killed. As for American deaths, the bloodiest day was September 17, 1862 at Antietam - 3,654 deaths, over 23,000 casualties. 9/11 is second in line. However, 100,000 Japanese were killed in the firebombing of Tokyo in World War 2.

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14y ago
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11y ago

About 3,650 people died in the battle of Antietam during the American Civil War.

About 3,500 people died in the Sept 11 attacks, outnumbering the deaths from Pearl Harbor (2403).

Over 8000 people died in the battle of Gettysburg which took about 3 days. It might have had the most people killed in the US in one day, but it is hard to tell, as the majority of the 46,286 casualties were injuries.

On D-Day, approximately 6,600 US soldiers became casualties (the majority of which were injuries).

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15y ago

August 6th, 1945. Over 70,000 dead instantly in Hiroshima, Japan on impact of "Little Boy", the first atom bomb ever used. August 9th, 1945 comes second, with between 45,000 and 75,000 immediate deaths in Nagasaki, Japan, on impact of "Fat Man".

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13y ago

"The Battle of Arausio took place on October 6, 105 BC, at a site between the town of Arausio (modern day Orange, Vaucluse) and the Rhône River. Ranged against the migratory tribes of the Cimbri under Boiorix and the Teutoni were two Roman armies, commanded by the proconsul Quintus Servilius Caepio and consul Gnaeus Mallius Maximus. Roman losses are described as being up to 80,000 troops, as well as another 40,000 auxiliary troops (allies) and servants and camp followers --- virtually all of their participants in the battle. All deaths attributed to weapons prior to the invention of gunpowder." Basically, one very large knife fight.

Mommsen, Theodor; The History of Rome, Book IV.

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14y ago

Atomic bomb explosion in Hiroshima/Nagasaki

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10y ago

World War II, if you're counting overall casualties, and not just US casualties. As far as American casualties go, the American Civil War.

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12y ago

Cannae

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Q: What battle had most casualties in one day?
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Was the Battle of Shiloh the bloodiest of the civil war?

No. The battle that had the highest casualties for one day was Antietam. Gettysburg's 3-day battle was the bloodiest. Shiloh was the first large battle in Spring of 1862 with thousands of casualties. When people read about this, they realized the war would be long and very bloody.


What was the deadliest war in the Civil War?

Do you mean battle? Anyway, the deadliest battle of the American Civil War was the Battle of Gettysburg with a total of 46,000 to 51,000 casualties in three days! The Battle of Antietam was the deadliest ONE day battle with a total of 23,000 casualties!


What battle in the civil war had the most total casualties?

Gettysburg, lasting three days, had the highest total number of casualties. Antietam, lasting one day, had the highest single-day total. Antietam. (Or Sharpsburg, as the Southerners call it.) Sept. 1862.


What was the bloodiest battle of the Civil War in Virginia?

The Battle of Chancellorsville fought from May 1-4 of 1863 generally receives this dubious honor. About 133,868 Union troops under the command of Joseph Hooker had 17,278 casualties. Robert E. Lee had only 60,892 troops and a casualty count of 12,821. By way of comparison the total casualties at Gettysburg in Pennsylvania was 51,112, and lasted for three days. The one day battle at Antietam near Sharpsburg, Maryland involved less troops but had 12,401 Union and 10,316 Confederate casualties. The most lopsided battle was at Cold Harbor, Virginia when Grant had 13,000 casualties compared to Lee's 2,500 in a 13 day battle.


Bloodiest battle in a single day during the civil war?

Antietam saw the highest one-day casualty lists.

Related questions

Most dead in one battle at World War 1?

During the first day of the 1st battle of the Somme, the British suffered 20,000 casualties


What is the single bloodiest war during the civil war?

Highest casualties - Gettysburg (3-day battle) Highest casualties in one day - Antietam/Sharpsburg


Was the Battle of Shiloh the bloodiest of the civil war?

No. The battle that had the highest casualties for one day was Antietam. Gettysburg's 3-day battle was the bloodiest. Shiloh was the first large battle in Spring of 1862 with thousands of casualties. When people read about this, they realized the war would be long and very bloody.


What was the deadliest war in the Civil War?

Do you mean battle? Anyway, the deadliest battle of the American Civil War was the Battle of Gettysburg with a total of 46,000 to 51,000 casualties in three days! The Battle of Antietam was the deadliest ONE day battle with a total of 23,000 casualties!


What was the outcome to Antietam?

it was clear that no one won the battle and was the bloodiest one day battle in American history because 23,000 casualties and 4,000 dead


What battle in the civil war had the most total casualties?

Gettysburg, lasting three days, had the highest total number of casualties. Antietam, lasting one day, had the highest single-day total. Antietam. (Or Sharpsburg, as the Southerners call it.) Sept. 1862.


When was the single bloodiest day of the civil war?

The single most bloodies day was in Maryland. There at the stream called Antietam, the one day battle of the Battle of Antietam, took place on September 17,1862.There were over 25,000 casualties, no battle ever since saw so much bloodshed in all the wars the US has fought.


What fact about the Battle of Antietam makes it one of the most tragic days in Us?

It was the single battle with the highest casualties of the US Civil War.


When was the single bloodiest day of the US Civil War?

The single most bloodies day was in Maryland. There at the stream called Antietam, the one day battle of the Battle of Antietam, took place on September 17,1862.There were over 25,000 casualties, no battle ever since saw so much bloodshed in all the wars the US has fought.


When was the bloodiest day of US Civil War?

The bloodiest day of the US Civil War took place at the Battle of Antietam. It was a one day battle on September 17, 1862. Combined casualties were close to 23,000. No battle fought by Americans before or after Antietam had a one day casualty rate higher.


Why do you call it d day?

It is called "Death Day" because it was one of the worst battles in world war 2, it had more casualties then any other battle.


What was the bloodiest battle of the Civil War in Virginia?

The Battle of Chancellorsville fought from May 1-4 of 1863 generally receives this dubious honor. About 133,868 Union troops under the command of Joseph Hooker had 17,278 casualties. Robert E. Lee had only 60,892 troops and a casualty count of 12,821. By way of comparison the total casualties at Gettysburg in Pennsylvania was 51,112, and lasted for three days. The one day battle at Antietam near Sharpsburg, Maryland involved less troops but had 12,401 Union and 10,316 Confederate casualties. The most lopsided battle was at Cold Harbor, Virginia when Grant had 13,000 casualties compared to Lee's 2,500 in a 13 day battle.