During World War One, two British nurses set up a first aid station just a few hundred metres behind the trenches of the Western Front. Mairi Chisholm and Elsie Knocker became known as “the Madonnas of Pervyse”. Mairi Chisholm spoke to the BBC in 1977.(Photo: Mairi Chisholm (left) and Elsie Knocker. courtesy of Dr Diane Atkinson, author of Elsie and Mairi Go To War)