Like most Civil War Generals on both sides, he was unaware of what a soldier with the new types of rifles they were equipped with in the war could do to the enemy. Plus General Ambrose Burnside was a terrible general who sent wave after wave of soldiers into battle, even though it was obvious that they had no chance of victory (without a great many casualties). Gen. Burnside was sent home after the failure of the Crater attack on Vicksburg and not recalled back to duty.
In WWI, such experiences were repeated; only this time by sending wave after wave of soldiers against the enemy armed with machines guns. The machine guns did the same thing, only much worse than the rifles did in the Civil War.
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It appears you need to provide more information...the Allies over history had casualties in wars large and small. Feel free to edit the answer for more specifics, and someone will answer it appropriately.
it would prevent high casualties that would be caused by an invasion of mainland japan
During D-Day at Sword Beach, Britain lost about 550 Soldiers.
Despite high casualties, it was a victory.
Approximately 10,000 soldiers died.The liberation of France.