I quite like playing in the mud. But I’d probably feel different if I was a soldier in the trenches during World War One. WW1 SOLDIER JACK: Mud? Oh, we know all about mud here on the Western Front.

More than 80 people raise funds for homeless veterans by sleeping in replica World War One trenches. The Bradford brothers are thought to be one of the most decorated families of World War One.

This story originally appeared in the August 2014 issue of National Geographic magazine as "The Hidden World of the Great War ... of the trenches above. A journalist visiting one of the caverns ...

I quite like playing in the mud. But I’d probably feel different if I was a soldier in the trenches during World War One. WW1 SOLDIER JACK: Mud? Oh, we know all about mud here on the Western Front.