Years ago, Conte released a Civil War playset with an incredible terrain piece called "The Crater". It was the centerpiece of the three part fortifications fron the "1864" playsets.  Here in 2012 I made a couple of set-ups utilizing these classic terrain pieces. The set up using the two intact fortifications can be seen on the "Civil War - As Big as I Can Make It" page.  This page features the pictures  I took of the Crater set up.