> The amount of shells fired at the battle of as Verdun is so extremely high that you find layers of shells everywhere
On the first onslaught on the city, it is estimated the German fired around 2 millions shell on Verdun in two days. [1]
It is hard to imagine by today living standards the hell that people lived there.
> The land is literally filled with shells, bullets, scrapnel everywhere. Some are still live and just brought to the top of the soil by farm tractor machinery
Some forest area are still today considered the 'zone rouge'. There is still so many shell inside them that the access or activities there are forbidden [2].
Even in the area not considered 'zone rouge', it is still pretty common for farmers or forest workers to find back non-exploded shell regularly, even today.
[1]: https://www.youtube.com/watch?v=fINsiiUZtuc [2]: https://en.wikipedia.org/wiki/Zone_Rouge