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It seems to me that battles of the Napoleonic Wars were decisive in that they could decide a campaign in many ways. One well known example is that after the Battle of Austerlitz, William Pitt famously said "Roll up that map; it will not be wanted these ten years."

By contrast, battles in the Civil War, when they had a winner or loser, rarely were the decisive factor in a campaign. Instead, sieges and attrition eventually broke down the Confederate Army.

These wars were approximately 50 years apart so my question is what changed during those 50 years technology/doctrine wise that caused the temporary end of the "decisive battle?"

Are there any PoDs where a single battle during the Civil War could be decisive?
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