Hi, Ted,
It seems like any unit history that I read--or any first person account for that matter--frequently talks about the awful condition of roads during the war. So here we do see a nice perspective photo of the wall, but it is impossible to miss that rough area running along in front of it. It's easy for me to imagine that becoming a sticking, sucking mess in day-long rain. I've hiked through enough muddy fields to know what an ordeal a forced march would be over roads like that.
I was just musing.