▁ho ppers ". ▁Both ▁were ▁probably ▁m ined ▁during ▁the ▁War ▁of ▁ 1 8 1 2 . ▁Dun bar ▁C ave ▁is ▁reported ▁to ▁have ▁been ▁m ined ▁for ▁salt p eter ▁during ▁the ▁Mexican ▁War ▁of ▁ 1 8 4 8 , ▁but ▁commercial ▁development ▁has ▁destroyed ▁any ▁evidence ▁of ▁this . ▁Little ▁min ing ▁is ▁likely ▁to ▁have ▁happened ▁here ▁during ▁the ▁Civil ▁War , ▁since ▁the ▁Union ▁Army ▁captured ▁and ▁occupied ▁this ▁part ▁of ▁Tennessee ▁in ▁early ▁ 1 8 6 2 . ▁ ▁Geography ▁According ▁to ▁the ▁U . S . ▁Census ▁Bureau , ▁the ▁county ▁has ▁a ▁total ▁area ▁of ▁, ▁of ▁which ▁ ▁is ▁land ▁and ▁ ▁( 0 . 9 %) ▁is ▁water . ▁ ▁Dun bar ▁C ave ▁ ▁Mont gom ery ▁County ▁lies ▁in ▁a ▁region ▁of ▁well - develop ed ▁kar st ▁top ography . ▁A ▁large ▁cave ▁system ▁is ▁named ▁Dun bar ▁C ave . ▁ ▁Dun bar ▁C ave ▁is ▁the ▁center pie ce ▁of ▁Dun bar ▁C ave ▁State ▁Park , ▁which ▁en comp ass es ▁approximately ▁ 1 1 0 ▁acres ▁and ▁is ▁one ▁of ▁the ▁most ▁visited ▁units ▁in ▁the ▁Tennessee ▁State ▁Park ▁System . ▁ ▁Dun bar ▁C ave ▁was ▁extens ively ▁used ▁by ▁pre histor ic ▁Indians , ▁who ▁inhab ited ▁this ▁area ▁for ▁thousands ▁of ▁years ▁before ▁European ▁encounter . ▁Rem ains ▁of ▁their ▁can e ▁tor ches ▁have ▁been ▁found ▁in ▁the ▁cave , ▁and ▁arch ae olog ists ▁have ▁exc av ated