Trudging by Corbie Ridge one winter's night,
(Unless old hearsay memories tricked his sight)
Along the pallid edge of the quiet sky
He watched a nosing lorry grinding on,
And straggling files of men; when these were gone,
A double limber and six mules went by,
Hauling the rations up through ruts and mud
To trench-lines digged two hundred years ago.
Then darkness hid them with a rainy scud,
And soon he saw the village lights below.

But when he'd told his tale, an old man said
That he'd seen soldiers pass along that hill;
'Poor silent things, they were the English dead
Who came to fight in France and got their fill.'

Siegfried Sassoon

http://www.poemhunter.com/poem/two-hundred-years-after/