I'm surprised Raoul doesn't weigh-in on this.
Because the Belgian and French government have
hired several thousand personnel called "deminers"
to clear out literally hundreds of thousands of unexploded shells
left over from WW1 & WW2 battle-sites that are familiar
to all of us who took European history in school.
There are also plenty [thousands] of mustard-gas and phosgene-gas
projectiles still laying buried there too.
In fact, on Discovery Channel, they quoted the French authorities
as saying that it will take 700 years to remove all those unexploded
munitions from Verdun, Normandy, etc...
Jacob