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Hmm, I may have been playing this wrong all along.
The Soviets do have artillery attached to armies and I've always given them the spotter bonus. Guess my eyes glossed over the specific "divisional" attribute.
Even with that bonus, I can't get the Soviets to close the pocket on an historical time scale. But I suck, so...
Might be a good question to bring to the SCS forum on CSW for a final ruling.
Once things start moving for the Germans unless its color coded to a unit I can see I am not apply the bonus. It seems to work the way it is playing this way.