Target density rule

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Indirect Fire Density – In addition to the normal modifiers (see Combat Results), in an Indirect Fire attack (only), each target unit’s Strength Points are multiplied by the applicable nominal Attack Strength and the result is then divided by 6 to find the effective Attack Strength vs. that unit. (In other words, effective Attack Strength = [nominal Attack Strength * SP#] / 6)
Example: A 6 Strength Point target will have the nominal Attack Strength applied to it. A target unit of 2 Strength Points will have 2/6 (1/3) of the Attack Strength applied to it. The rationale for this calculation is that the Indirect Fire results against a single target unit of, say, 4 Strength Points should be the same as the total Indirect Fire results against two target units of 2 Strength Points in the same hex. The calculation will apply the indirect Fire Attack Strength against target units proportional to their Strength Points, thus resulting in a total combat result comparable to firing at a single unit of the same total strength.

This is all I could find.

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