Now, after initial examination, museum experts believe that the metal belonged to a British aircraft that crashed in the woods during the waning days of World War II. The Chance Discovery Of Remains From A World War II Plane In A Polish ForestApart from the initial debris, experts from the museum also discovered ammunition and various metal components of a war plane. After initial analysis, they determined the ammunition to be .303 British caliber cartridges, which were commonly used in Royal Air Force Browning machine guns during World War II. Therefore, experts speculated that the wreckage belonged to an Allied aircraft, likely one from the British Royal Air Force. Germany’s anti-aircraft defenses made the region’s skies especially dangerous, and many Allied aircraft were lost in the area.