It never happened.
Because Richmond was the capitol of the Confederate States of America, where the Confederate leaders were all located. Only miles form Washington DC, capturing the confederate leadership would disrupt all elements of the confederates operations.
Because its part of America
Washington dc is not a state.
Washington, DC
Washington DC
Washington - Baltimore Washington International, DC, USA (BWI) Washington - Washington - All Airports, DC, USA (WAS) Washington - Ronald Reagan National Airport, DC, USA (DCA) Washington - Washington Dulles, DC, USA (IAD)
there are no counties in Washington DC because Washington DC is a city itself.
Washington DC
Washington, DC
On the mall in Washington, DC.
Washington DC was named by george washington.
Washington is the state of the United States and Washington DC is the capital.