There's a lot of this stuff around! About 10yrs ago, my dad caused a lengthy shutdown of the channel tunnel after a piece of metal (he'd assumed it was a machine gun barrel) he picked up on the Somme battlefield was found in the boot of his car during a random search. It was a live WW1 mortar. They closed the tunnel and detonated it at the terminal.
As farmers work on the fields in northern France they regularly find artifacts from the war and just toss them aside as an annoyance.
As farmers work on the fields in northern France they regularly find artifacts from the war and just toss them aside as an annoyance.