Mark -
Great stuff. Fooled me. Your earthworks redan at Petersburg is a reminder that the naming of the "Redan" at NB was attributable to the steep bank running the length of the left side of the green. That was the feature that reminded people of a redan fortification.
The name had little to do with the angle or slope of the green, which is how most people would define a Redan today.
Your picture is also a reason why a real Redan hole should be slightly uphill, like the original at NB. As a defensive fortification, it should be intimidating. To get the right effect, you should be looking up at the redan earthwork.
Bob