The Schwaben Redoubt.

[sandyRoe]

I was watching a TV documentary the other night about the Somme and it was mentioned as one of the few objectives actually taken on the first day.
What would it have looked like? I can't imagine it was anything like a fort or a castle because if it had been artillery would have reduced it to rubble.
I'd guess it was just a mass of wire, more trenches, more machine guns, and in a good position.

[retrocop]

And probably loads of sandbags with fall back defences and loopholes for enfillading fire and flank attacks.
The wall of mealy bags in the film zulu was called a redoubt.
A defensive position within another. I suppose like a castle keep

[Buenchico]

I'm dashing for a train, so I won't try posting links but try googling 'schwaben redoubt' and clicking on the 'Images' link. That looks as if it might help.

[shaneystar2]

They only seem to have ariel pics on Wiki although there is a painting of what it may have looked like . You have to scroll right down.
https://en.wikipedia.org/wiki/Capture_of_Schwaben_Redoubt

[RetroChic2]

Some interesting info here:

https://en.wikipedia.org/wiki/Capture_of_Schwaben_Redoubt

[RetroChic2]

snap!

[sandyRoe]

In the same way that a haha is a sunken wall, a redoubt on the Western Front seems to have been a sunken fort.