War- Grass by Carl Sandburg

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.

These wars and the people, the bodies, human lives buried under the ground, covered by grass.  Have we forgotten our mistakes Sandburg asks in this poem?  What lessons have we learned from the loss?  The grass grows doing it's job covering our faults and our shame of the wars that have taken people from this earth.
We are only happy to allow the grass to cover our denial of the truth. There are many  lives lost as he refers to 'pile them high" and let the grass cover the shame of our sin in killing so many innocent. Questioning what this has brought us, there is no answer given, only the continued denial of the piles and piles of lives that were lost.  The writer's bigger message is about forgetting our history will only lead us to repeating tragic mistakes for which people paid for with their lives.