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Shortly after 9 a.m., 20 December 1941, on an airfield near Hanoi, ten Ki-21 type 97 heavy bombers roar skyward to deliver a load of bombs on Kunming. However, they were never to reach their destination. An intricate network of early warning communications had located them and tracked their progress as they approached the target. Approximately 130 kilometers from Kunming, the American Volunteer Group 1st and 2nd squadrons were alerted to intercept them. During the battle that was to follow, six of the ten bombers were destroyed and of the four that turned for home, only one made it back to safety.