I remember fighting this fight in East Front 2 by Talonsoft. It was about 25-30 turns long and I can tell you it took everyone of those turns to get a minor victory. I had to move my tanks, engineers, & infantry units to the rear of the silo's. No matter how much artillery was used I couldn't get those russains out of the silo's, and if I recall there was hardly any damage to the silo's. However, with the use of smoke and using my infantry I waited until they had spent their action points up firing back at the infantry
then I used my engineers an tanks to drive them out into the open where I was able to take over the silo's and finally defeat those red devil's.