In December 1944, just before the German offensive, a 17-year-old Belgian resistance member named Marie (last name still partially classified) bicycled through German positions to deliver a message to Allied intelligence. She had memorized — not written down — the exact positions and strength of the 6th SS Panzer Army's assault formations. Her intelligence reached SHAEF at 3:00 AM on December 16, but was dismissed as unreliable and filed. The Battle of the Bulge began at 5:30 AM. Marie survived the war, emigrated to Canada, and her story only became public in 2019 when her son found her coded resistance diary while clearing her estate. She had bicycled 47 kilometers through snow in a single night.