"Chakoten" is a magazine published by Dansk Militaerhistorisk Selskab
There is a great 2012 issue with several articles on the GNW, including a lengthy one on the Battle of Gadebusch. While it is in Danish, there are numerous color uniform plates, maps and other pictures. It can be downloaded from here:
http://www.chakoten.dk/Nr.%203,%20side% ... 202012.pdf