On 5 October 1943, NJG 1 with NJG 2 formed the 1. "Jadgdivision", covering the Netherlands, Belgium and the Ruhr. Operation Corona and Mandrel further confused night fighters as was evident in the October attack on Kassel; in which everything when wrong for the defences. A Naxos radar detector-equipped night fighter recognised the change in course and was able to bring 180 night fighters to Kassel where they destroyed 39 bombers for the loss of six. NJG 1 could claim only four. Meurer, Schnaufer and Werner Husemann were among the claimants.