HELP!

A patron of our library has asked if we could track down this poem for him. He is 82 and remembers it from school but can only recall parts of it. Can anyone help? Does anyone recognise it?

They were two ordinary soldiers
just the common Jean and Hans
one from the Valley of the Rhine
and one from fair Provence

And St Michael came to meet them
and he smiled to see them stare
when he told them vater unser
was the same as notre pere

Sorry, I tried. :[
Wanted to read it,
But couldn't find anything.