Can Anyone search the battlefields?
In France, Belgium and Germany searching the battlefields with a metal detector is not encouraged. This is mainly to do with public safety. There is no law against walking a battlefield with a map, unit history, camera. Of course you should be aware of any private property you might trespass on. Very often local people can be helpful if asked about the history of their town or village, and might even unearth a keepsake of their own to show the traveller.