In December 1944 during World War II, the German army launched a surprise offensive meant to change the course of the war.
How careful cleaning and preservation uncovered details from a relic that survived decades of corrosion.
When World War II ended, and the United States stood triumphant, another, quieter victory was unfolding beneath the surface.
A top-secret WW2 blueprint for the famous D-Day landings is expected to fetch £100,000 at auction in Derbyshire after coming to light after 83 years.