Statistics for occurrence #1 of “Forts Donelson” in chapter 30 of Colonel William Preston Johnston, The Life of General Albert Sidney Johnston : His Service in the Armies of the United States, the Republic of Texas, and the Confederate States.:

...th armies at Cairo and Paducah, under Grant and C. F. Smith, threatened equally Columbus, the key of the Mississippi River, and the water-lines of the Cumberland and Tennessee, with their defenses at Forts Donelson and Henry. Buell's right wing also menaced Donelson and Henry, while his centre was directed against Bowling Green, and his left was advancing against Zollicoffer at Mill Spring on the Upper Cumberla...
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