The parallelism found in lines 4-5 “And pile them high at Gettysburg” “And pile them high at Ypres and Verdun” helps to show the speaker’s view points, which can best be described as Pile the bodies high at Austerlitz and Waterloo.

Shovel them under and let me work—
I am the grass; I cover all.

And pile them high at Gettysburg

And pile them high at Ypres and Verdun.

Shovel them under and let me work.

Two years, ten years, and passengers ask the conductor:
What place is this?
Where are we now?
I am the grass.
Let me work.

Your

He is opposed to war

Agrees that war is necessary

Thinks grass has many issues