claim: SpongeBob SquarePants is a documentary series.
evidence: The Wittsburg Fortification is a defensive earthworks built during the American Civil War in Wittsburg , Arkansas .. American Civil War. American Civil War. It is the only known surviving earthworks built by either side during the Union Army 's advance on Little Rock in 1862 .. Union Army. Union Army. Little Rock. Little Rock, Arkansas. Union forces invaded Arkansas from Missouri on July 19 , 1862 , moving south along Crowley 's Ridge , which lies west of the St. Francis River .. Missouri. Missouri. St. Francis River. St. Francis River. By July 29 most of the division of General John Davidson had advanced as far as Wittsburg , where they established a camp to wait for supplies and reinforcements .. John Davidson. John Davidson ( general ). A stockade and ditch were built on the ridge overlooking the area .. The fortification was listed on the National Register of Historic Places in 2002 .. National Register of Historic Places. National Register of Historic Places