Chicago Skirmish Wargames

Thanks for the great review! Sorry for the non-sequitur, but how did you all make those rock formations? They're really realistic!

Chis supplied the terrain, so he would know for sure, but I believe they are Gale Force 9 Rocky Hills.

The larger hills are indeed Gale Force 9 Battlefield In A Box hills. They're relatively cheap and have tons of utility because they're mostly flat sections, so models can balance on them. (An often overlooked detail for terrain makers!). They come with the flocking, which is just glued on in various spots, but I did repaint them slightly with some highlights and browning on the edges for added realism.
The smaller rocks, tree bases, and water areas are resin casts from Worldsmith Industries. He'a had a few small kickstarters which is where I got those from. I painted all of that also, since they were just resin gray, and added some water effects to the pond.
I may have to do a terrain painting tutorial sometime, but the process for natural formations tends to be pretty easy.
You can also craft formations on your own very similar to these using a sharp razor, foam, sand/latex paint, and possibly some natural elements such as pine bark for some extra detailing (which also works amazing on display bases). I did a hills tutorial for Ghost Archipelago not too long ago.