If the State of Kentucky was in some manner, somehow, to remain a neutral zone, without the movement of the contending armies, etc., it was a defensive buffer for Confederate Tennessee. But militarily, advancing into Kentucky was the other option for the Confederates.
General Polk entered Kentucky about September 7, and occupied Columbus on the Mississippi, south of Padukah. General Grant's US forces at Cairo, IL responded by moving to Paducah. General Polk informed Governor Magoffin of Kentucky that he would withdraw his troops back to Tennessee, etc. if the Union troops also withdrew from Kentucky, and the neutrality restored.
The Kentucky legislature however, resolved demanding the CSA forces withdraw from the State, and the Governor communicated this to Polk, desiring he withdraw...
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At that point, the Confederates felt the neutrality of Kentucky they had relied upon was essentially over. Jefferson Davis at Richmond ordered Polk to stay put, and await arrival of General Johnston.
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The same day, Davis at Richmond informed Governor Harris of Tennessee, that the security of Tennessee required the CS troops to remain at Columbus, Kentucky for the time being...
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On the 15th of September, Davis wrote General Polk approving of his operations in Kentucky, and encouraging him to hold fast, as Gen. Johnston was en route...
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General A.S. Johnston arrived about the scene and took general charge of the affairs. Johnston's son says he talked briefly about the situation in late 1861 with his father. And observes that
Kentucky's neutrality WAS the defensive line of the Confederacy along the Tennessee border. When it was no longer a buffer for the Tennessee border, Gen. Johnston pressed CSA troops to occupy Bowling Green.
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General Johnston issued the following proclamation to the Kentuckians, etc.
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Afterwards, noted the younger Johnston, even with CSA forces in Kentucky, they were at a distinct disadvantage, and numbers of Tennesseans were passing into Kentucky and many organizing with the Union Army, etc.
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This map depicting the situation by February, 1862, shows the situation. The Tennessee State line from Cumberland Gap on the east, to the Mississippi River to the west, was a long border, and largely unguarded even by then. The Confederates concentrated at Columbus and Bowling Green Kentucky, and at Forts Henry and Donelson on the Cumberland and Tennessee rivers (in Tennessee, near the border) and at Cumberland Gap.
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