Australian ambulance men carrying soldiers suffering from Trench Foot at Bernafay, northern France, during World War One. Around 75,000 British soldiers suffered from the condition during WW1.

Except it wasn't a rat, but a young kangaroo brought from Australia by Indigenous soldier ... cats and a monkey as companions in the trenches. "The trenches were dismal places.

Australian troops charge near a Turkish trench just before the evacuation at Anzac. 1915. Source: © CORBIS/Corbis via Getty Images ...