Played this scenario with the illumination optional rules, it did help the German ATG & Flak guns, they were able to engage the Soviets at longer ranges than 2 hexes, on the other hand it did allow the Soviets to spot the guns which they responded with mortar and artillery fire to suppress or eliminate.

The Soviets overran the German blocking forces, but it took time as the Germans did not want to give up their positions. Needless to say, the Soviets were not able to gain any of the victory conditions.