Four days the earth was rent and torn
By bursting steel,
The houses fell about us;
Three nights we dared not sleep,
Sweating, and listening for the imminent crash
Which meant our death.

The fourth night every man,
Nerve-tortured, racked to exhaustion,
Slept, muttering and twitching,
While the shells crashed overhead.

The fifth day there came a hush;
We left our holes
And looked above the wreckage of the earth
To where the white clouds moved in silent lines
Across the untroubled blue.

Siegfried Sassoon

http://www.poemhunter.com/poem/bombardment/