Trees in the old days used to stand
And shape a shady lane
Where lovers wandered hand in hand
Who came from Carentan.

This was the shining green canal
Where we came two by two
Walking at combat-interval.
Such trees we never knew.

The day was early June, the ground
Was soft and bright with dew.
Far away the guns did sound,
But here the sky was blue.

You can read the rest of the poem here http://www.poets.org/poetsorg/poem/carentan-o-carentan

Or listen to Charles Durning read the poem from the D-Day documentary ‘Normandy – The Great Crusade’ https://www.youtube.com/watch?v=rtb1gxZ9kM0

For a detailed analysis of this poem see John Lucas, Second World War Poetry in English, pp. 175-6