Help Some in invis some not!!!

Help Some in invis some not!!!

Plz help ! I made a orc wall simply using a plane then extrueded it and when I test on one side visible and other side norm plz help!! I used Vertex modyfier and i think I clicked relocate normals.

I've had this problem

In the Materials I believe you can set a texture to be doublesided or not. I'll have to look up where you need to set it though. Happans to me lots =(