Mechanized potato harvesters just pick up lumps out of the ground, doesn't matter whether the lump is a potato , dirt clod, or hand grenade. Until the dirt is washed out, it's impossible to tell what the lump is. Given the size and shape of a grenade, the dud rate (around 5-10%) and the fact that a lot of WW1 and WW2 battles were fought on farmland, I'm surprised it doesn't happen more often.
We're 60+ years separated from WW2, and they're still finding unexpxloded 500 Lb bombs. There were a lot more hand grenades thrown than bombs dropped.
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12/02
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