As someone mentioned earlier in this thread (I forget who), area fire seems quite ineffective. I recently played the Yelnia Stare (?) scenario as the russians. I had atleast 4-5 maxims and 2 mortars pouring fire into the central german position, and still my troops on the left flank (2 companies) got pinned down and routed by fire from that position.
After 15-20 turns of VERY slow progress on my left flank I had at least knocked out 2 at-guns with mortar and mg fire. I now felt confident enough to take bold action with my tanks. Up to that point I had used my tanks for area fire from the rear. I rushed the tank platoon on my left along the extreme left om the map to a position in front of my most forward troops. I gave fire arcs to two of them; one covering the nearby objective and one covering the central flag. The third tank was left to find it's on targets, just in case.
On my right flank, where the infantry only had advance to the burning wheat field, I moved the other tank platoon to the forward edge of said field.
These tank advaces remedied the situation a bit, but the infantry was still advancing too slow to reach the objectives in time. As a last effort I rushed the tank platoon on my left to within 100m of the central flag. That did the trick! As the tanks started to spot all the german infantry in that area, red targeting lines where appearing in droves! All those squads and mgs that weren't routed suddenly found something to direct their anger at! As the german fire withered, I was able to advance my infantry without too much trouble.
The scenario ended with the germans surrendering, and I actually suffered quite few casualties!