By early 1862, a single Confederate general, Albert Sidney Johnston, commanded all forces from Arkansas to the Cumberland Gap. His forces were spread thinly over a wide defensive line. His left flank was Polk in Columbus with 12,000 men. The center consisted of two forts under the command of Brig. Gen. Lloyd Tilghman, with 4,000. Forts Henry and Donelson were the sole positions to defend the important Tennessee and Cumberland rivers, respectively. His right flank was in Kentucky, with Brig. Gen. Simon Bolivar Buckner's 4,000 men in Bowling Green, and about 4,000 in the Military District of East Tennessee under Maj. Gen. George B. Crittenden, which had the responsibility for guarding the Cumberland Gap, the gateway for entering pro-Unionist East Tennessee.