It was a beautiful day, so i went to south of Nijmwegen to a village named Mill where in may 1940 where a battle took place. The line is named the Raam-Peel line. Here are some sites for more information (mainly in Dutch) http://nl.wikipedia.org/wiki/Peel-Raamstelling http://www.stichtingsporenvandeoorlog.nl/ http://www.webridder.nl/slagbijmill/ http://www.mill1940.nl/