I. "Gruppe" of ZG 1 participated in the Battle of France. On 22 June 1940, "General der Flieger" Albert Kesselring called Falck that Hermann Göring, commander-in-chief of the Luftwaffe, had tasked him with the creation of the first night fighter unit. His orders were to relocate to Düsseldorf immediately. Four days later, he was ordered to a meeting held at Wassenaar in the German-occupied Netherlands. This meeting was attended by Göring, the Generals Kesselring, Bruno Loerzer, Ernst Udet and Friedrich Christiansen, among others. During the meeting, Göring appointed Falck as "Geschwaderkommodore" and tasked him with creation of "Nachtjagdgeschwader" 1 (NJG 1—1st Night Fighter Wing).