Some army officers, however, encouraged the presence of prostitutes during the Civil War to keep troop morale high. On August 20, 1863, the U.S. military commander Brig. General Robert S. Granger legalized prostitution in Nashville, Tennessee, in order to curb venereal disease among Union soldiers. The move was successful and venereal disease rates fell from forty percent to just four percent due to a stringent program of health checks which required all prostitutes to register and be examined by a board certified physician every two weeks for which they were charged five dollars registration fee plus 50 cents each time.