The two battles that had significant impacts on Confederate supply lines are:
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The Battle of Vicksburg: Union forces took control of an important strategic location on the Mississippi River. This victory effectively split the Confederacy in two and gave the Union control over the river, which was a critical artery for transporting supplies and reinforcements. The loss at Vicksburg severely hindered the Confederacy’s ability to move goods and troops across its territory.
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The Battle of Atlanta: Union forces destroyed a major transportation and railway hub in the South. Atlanta was a vital center for the Confederate supply chain, and its capture disrupted logistics and transportation, making it difficult for Confederate troops to receive supplies and reinforcements, which was crucial for sustaining their military efforts.
These two battles critically undermined the Confederate supply lines and made it increasingly challenging for the South to maintain its war effort.