Yea...I can understand that I guess. Much the same here in the UK as well. Mind you, battles were fought in many places other than the 'known' battle grounds.
I've been to Germany quite a few times, down to Nuremberg & I've detected the old defensive sites from WW11 & found some quite interesting stuff...plus a bit of dangerous stuff! My mates & I used to get into some of the underground bunker systems on the Obersalzburg in Berchtesgaden as well to take a look around but most of that has been sealed up in the past few years by the Bavarian government.
Another thing I tend to do is look out for rabbit holes &mole hills on historical sites such as the Roman amphitheatre in St Albans or the various locations along Hadrian's wall as I've found a fair few pieces of Roman pottery/glass & bone tools doing that.
Always got my eyes to the floor...hence I walk into things a lot!