General Leonidas Polk's invasion of Columbus ends…
1862 CE
Grant uses river transport and Andrew Hull Foote's gunboats of the Western Flotilla to threaten the Confederacy's "Gibraltar of the West" at Columbus, Kentucky.
Although rebuffed at Belmont, Grant cuts off Columbus.
The Confederates, lacking their own gunboats, are forced to retreat and the Union takes control of western Kentucky and opens Tennessee in March 1862.