This my Ork army advancing across the battlefield.
The scenery tiles are “homemade” using blocks of 4′ x 1½’ polystryene which I covered in the (original) Games Workshop gaming grass mat. I have four of these blocks, as the 6′ x 4′ grass mat covered them easily.
The hills are from a company I can’t remember and find at the moment!
Trees are model railway tress and there is a bunch of lichen in there as well.