what Is the state based efficiency for?
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The first 8 infantry will function, and the rest are mostly along for the ride. They are hiding behind the first 8 with their hands in their pockets and trying not to get shot at, while taking credit for the accomplishments of the first 8.
Of course there is another aspect, which is damage absorption. When your stack of 30 infantry is attacked the first 8 return fire, but the damage done to the group is spread among all 30.
If 30 damage is done to a stack of 8 infantry, then 2 infantry are eliminated.
If 30 damage is done to a stack of 30, then each one loses one hit point.
So each method has advantages and disadvantages. I break the rules of SBDE when the situation calls for it.