Simplify the following text for a Grade 7 native English-speaking person.
Original: On December 12 , Stoneman 's force flanked and forced back Confederate General Basil Duke 's cavalry at Rogersville , Tennessee .
Simplified: On December 12 , Stoneman 's force flanked and forced back Confederate Brig . Gen. Basil W. Duke 's cavalry at Rogersville , Tennessee .