On September 17, 1944, the day Operation Market Garden launched, a Dutch resistance member using the codename "G崇rrit" (Gerrit) transmitted the complete German defensive positions in the Netherlands to Allied intelligence — from a radio in a cemetery near Arnhem, using a stolen Wehrmacht battery. His intelligence was accurate to the company level. It arrived too late to change the plan but may have saved hundreds of lives by alerting units to the SS tank positions that weren't supposed to be there. The spy, whose real name was Jan and whose last name remains partially classified by Dutch intelligence, was betrayed by a double agent in October 1944. He was executed by the Germans on November 12, 1944. His final words to the firing squad were: "I knew what I was doing." He was 23 years old.