How do you anchor a solid layer to a map to illustrate an animated frontline???

Thanks very much for your help Airweb_AE. The only problem is that I like to add "turbulent displace" to my layers as it gives me a more fluid and interesting animated mask. The problem is that adding turbulent displace to a 3D layer causes that layer to vanish. So it looks like either I stay in 2D with turbulent displace on or go 3D and with no turbulent displace, unless I precomp the map with layers, then go 3D. 

What I found quite interesting about Boone's method though is that if you use a Solid Layer (as opposed to a Shape Layer) you can still add the Turbulent Displace effect to that Solid Layer and it won't disappear even after checking it's 3D box. I don't recall if Boone mentioned that, but it's really cool that you can do that with Solid Layers. Thanks again very much for your help, 😀.