So in LOTR, when the trees themselves take part in the war in reaction to the destruction of their own, probably comes from Tolkein seeing what happened to nature on a battlefield.
You could definately say that.
But there was more emphasis on the fear of a dark army making weapons and getting bigger.
I remember in the dvd extra talked about the scene mainly showed the destructive force growing.
Similar to the German military machine, churning out weapons and getting bigger.
Mind you all influence is from Tolkien’s military experience in WW1.
The story starts out happy for the first few pages and is dark all the way to the end.
The loss of hope in a long bloody war.
Jackson perfectly captured the emotion of the novels and put them into the silverscreen.