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/