The two battles that had significant impacts on Confederate supply lines are:
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The Battle of Vicksburg: This battle was crucial because Union forces captured Vicksburg, which was a key position on the Mississippi River. The victory effectively split the Confederacy in two, cutting off vital supply routes and resources that flowed along the river. Control of Vicksburg meant that the Union could disrupt the flow of supplies and reinforcements to the Confederate forces in the western part of the Confederacy.
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The Battle of Atlanta: The Battle of Atlanta significantly impacted Confederate supply lines because Union forces destroyed a major transportation and railway hub. Atlanta was a critical railroad center that facilitated the movement of troops and supplies. The fall of Atlanta not only disrupted these supply lines but also boosted Union morale and further weakened the Confederate war effort.
Both battles played essential roles in crippling the logistics and supply capabilities of the Confederate States.