On March 29 , 1861 it was evacuated by federal troops and reoccupied after the civil war until 1869 . Fort Mason was evacuated by federal troops on March 29 , 1861 , and reoccupied after the Civil War until 1869 . On March 29 , 1861 , the Fort Fort Mason was reoccupied by federal troops and evacuated to 1869 after the civil war .