That's something 2 research in wikipedia. I can only say from knowing myself well enough that survival's key. Ditch usage helps in dodging many attacks. From knowing myself well, I discovered that I'm drawn 2 enclosed beds. This kind of mimicks a deep ditch. B'n German, Irish, & indian, I know they all fought in battle @ some point. No doubt my forefathers must've slept in ditches during wartime. German, Irish, & Indians were warriors. I read it somewhere yrs ago in a non-fiction library book.
Btw, I'm also drawn 2 tight spots.