NATO 6 Challenge

I'm having serious issues managing to accomplish this challenge. I've made it a habit to do the Challenge Scenarios in backwards order so to speak (so I do the last ones/most difficult from my experience back to the easiest.) I managed to do NATO 6 The Final Base's hard mode, but I'm stuck on the Challenge. I've got what I'd say is a fairly good stock of generals but my old strategy isn't working nearly as well as previously. I can take the first couple of cities on the main land but then I get obliterated by the Soviet elites and generals. I've been using Guderian, Rommel, Abrams, Konev, and Nimitz, and Kluge. Guderian, Rommel, Kluge, and Abrams are all maxed out. I've hoped to be able to seize enough to put Manstein on a King Tiger, but I usually get crushed before I can manage that.

I'm not really sure what the best way to do this one is, but I'm supposing I probably should've kept rumor on more generals than I have rather than putting inspiration on them. WTO 6 was easier than this by far.