Blockade Gun Boat Cover, C.1865. Addressed to Union sailor on blockade gunboat duty at Bridgeport, Alabama "On Board the Gun Boat General Thomas", with Pennsylvania postmark "Feb 13" (1865) tying #65; minor creases & slightly reduced at right, Fine and scarce. Estimate  $200 - 300. Four gun boats were built at Chattanooga under the orders of General Sherman to control the upper Tennessee River. $0 (Image)