it might be worth your time to search any local battlefields near you.
Idiot, it is illegal to use metal detectors or keep artifacts from National Battlefields.
My property butts up against a National Park where there were several Civil War battles. A local university sits on lands occupied by both armies at one time and when they do new construction they will run into unexploded ordinance and locals will once in a blue moon find them on their property.
My Dad recalls a local pastor who kept an unexploded cannon ball in their house as a door stop back in the 1950’s. I think someone finally told them hey, that thing is dangerous and they got it disposed off. My late uncle and his buddy were swimming in a pond in the park in the 50’s and found a mortar shell in the bottom of it and brought it up. The police came and got it and detonated it.
Idiot, it is illegal to use metal detectors or keep artifacts from National Battlefields.
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“Illegal” only matters when one gets caught!