from Playing at the World by Jon Peterson
http://playingattheworld.blogspot.com/2016/01/a-precursor-to-chainmail-fantasy.html
http://playingattheworld.blogspot.com/2016/02/a-conversation-with-len-patt.html
http://thecollectorstrove.com/gc-iv-bodenburg/
https://en.wikipedia.org/wiki/Siege_of_Bodenburg