Never read this poem before. I don't find it particularly morbid and it's certainly obvious this was a man well acquainted with the horrors of war.
The imagery is wonderful. He must have spent a long time honing alliteration, similes, metaphors and thinking of how to paint a picture with the words he used.
I loved the verse about the rain .......
"Rain—he could hear it rustling through the dark;"
Never heard the sound of rain described as "rustling". But it's kind of apt. It does quite sound like that at times.
Also loved ....
"silence heaped round him".
Very descriptive poem of what this soldier suffered and felt the few minutes before death became reality.