There are also a lot of those tags around Bonheiden - Rijmenam - Keerbergen: http://geschichtskarten.openstreetmap.de/historische_objekte/?zoom=13&lat=51.00577&lon=4.56379&layers=B0000FT
concerning these, I think this user is correct, that's the area I grew up in and it's packed with bunkers, the locations seem ok tool I'm pretty sure some of these where battlefields. There are places we called 'bomputten' , they have water in it now and are a primary place for aquatic life, so I would say battlefield , most of those places definitely are, but as for the fact if they are historic, I'm not too sure.
Glenn
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