Denmark Slesvig-Holstein. The Danish-German War (1848-1851). A lovely letter from the Swedish volunteer Lieutenant August Duse in the Danish Army, dated Jennum July 18, 1848 via the Danish Field Post system and Royal Mail via Helsingborg to Wadstena, Sweden. Red seal on back. Surcharged with only half the rate in blue as Danish Field post was free of charge in Denmark. Surcharge cancel unpaid from Denmark Helsingborg July 23, 1848. Listing letter chart nr 1 from Helsingborg to Wadstena. Full content is transcribed. Excellent quality and a truly postal history exhibition item!