I send 6 Soviet mtn. divisions as volunteers to help Rep Spain. I saved the game since their landing in Spain and tried several areas where they could make an impact. Again and and again I stumbled against some Nat Spain divisions that would hold forever without hardly experiencing a scratch. When I turned the same number of my divisions (3, to have a full front as they have 24 frontage) against an identical Nat division led by the same Nat leader in identical terrain, the Nat division would "melt" normally!! Even more incomprehensible, and as an example of this weird behavior, I encircled a Nat division of 3 brigades. It has been encircled for several weeks (a month already?) in hill terrain and even attacked a stack 2 and, later, 3 AI Rep divisions and basically never loses cohesion or strength. I have been attacking this invincible division for 2 weeks approximately with one my mtn. divisions and the invincible Nat division has hardly noticed. Is this WAD and, if it is, could some one explain to me the logic behind this strange behavior of some divisions?