.... Could not a cavalry force from General Thomas on the upper Cumberland dash across, almost unresisted, and cut the railroad at or near Knoxville, Tennessee? In the midst of a bombardment at Fort Donelson , why could not a gunboat run up and destroy the bridge at Clarksville? Our success or failure at Fort Donelson is vastly important, and I beg you to put your soul in the effort. I send a copy of...