During the four years of the Civil War, Ft. Stevens was the closest the confederates got to Washington. During the siege on the US Capitol building, supporters of Donald Trump paraded the confederate battle flag through the Capitol.
The portrait on the wall is of 19th century Vermont Senator Justin Morrill, one of the founders of the Republican Party. After the Civil War, he served on the Joint Committee on Reconstruction, requiring southern states to ratify the 14th Amendment before they’d be readmitted into the United States.