On 1 August 1940 a command post was established at Zeist near Utrecht in the occupied Netherlands. The Zerstörer pilots and units were used for conversion to night fighters. No night fighter training schools existed in 1940, until blind-flying schools were established at Schleißheim from 1941.[6] Kammhuber established the Kammhuber Line, which evenutally allowed radar to guide night fighters to RAF bombers.[7]