On December 20, Grant's command was reconfigured to include C.F. Smith's and renamed the District of Cairo. From that perch, in February 1862, Grant led the Union campaign against Fort Henry, on the Tennessee River, and Fort Donelson, on the Cumberland River. His troops for this campaign eventually numbered approximately 27,000 men, divided into three divisions commanded, respectively, by John McClernand (1st Division), C.F. Smith (2nd), and Brig. Gen. Lewis Wallace (3rd).