if you're talking about the revolutionary war, it is because it split up the south. also, the port of New Orleans was at the end of it, so all ships went there. if you controlled that, you controlled the whole river.
Dr. H
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Grant's decisive victory at the Third Battle of Chattanooga opened to door to the invasion of Georgia and to the deep Union penetration into the core of the South. Last but not least, the vital railroad linking the Confederate western states east from Mississippi and those of the eastern front had been interrupted for the rest of the war.
President Abraham Lincoln advocated for a policy of leniency toward the South because he believed it was vital to quickly heal the country's wounds. The war was fought from 1861 to 1865.
At the beginning of the US Civil War, the South's two main strategies were to protect the entire Confederacy from Union attacks. In 1862, Confederate President Jefferson Davis, announced that this strategy was not effective and the South did not have enough troops to carry on in that manner. He then explained that the new strategy would be to defend specific and vital parts of the South, thereby using their troop strength more effectively. As another component of this was to take advantage of any opportunities to invade Northern states and thus bring pressure on the North who were insulated from the war's destruction.
They wanted to capture the besieged Union Army of Cumberland, secure the vital line of lateral communication in the south and prevent Georgia from being invaded again.
Chattanooga and not Chickamauga was an important Railway Junction to the South. Chattanooga commanded following vital railway links: Mobile - Montgomery - Atlanta - Chattanooga, Chattanooga - Knoxville - Lynchburg, Memphis - Corinth Decatur - Chattanooga, Nashville - Murfreesborough - Chattanooga, Chattanooga - Atlanta - Augusta - Savannah and Charleston.