For instance, here are articles about two major WW1 battles:
https://en.wikipedia.org/wiki/Battle_of_Belleau_Wood
https://en.wikipedia.org/wiki/Battle_of_Delville_Wood
The battles are described in detail, but the devastation caused to woodland itself - a complex system of soil, vegetation, fauna - is not even an afterthought.
While it's charming that the color of flowers is affected by soil contaminants, the vegetation layer is just the base of the trophic levels that constitute an ecosystem.
All the other life in the woodland depends on the soil and vegetation. Contamination works its way through the entire ecosystem - definitely not charming.
I've been downvoted many times for my opinions, but the world needs a Geneva Convention that protects natural habitats in times of war. I would go further: this needs to reach a religious level of fervor, so that it would be unthinkable to put men and machinery into pristine natural environments as part of a strategy of human conflict.