Who put these here?

I'm driving the roads looking at the bocage - banked up lines of trees between the fields - that are their special hedges. As I view the pocket handkerchief sized fields I notice that some of these banks have not been maintained - the earth has slumped away leaving the outstretched tiptoes of their roots exposed.

In the war we (OK, and the Americans - they were there too) found it almost impossible to fight across the fields because of these high banks.

Reading about the war is pretty amazing. I know it was full of bravery but it was also jam packed full of stupidity and lack of knowledge. Fantastic planning, for instance, blown apart by not knowing about bocages!