How To Defend A City From Invasion Using Civilian Snipers As An Auxiliary To The Regular Army

"........all that really matters is that everybody knows that the invaders have committed themselves to a raid. Then, each civilian sniper individually rolls a six sided dice. If they are disciplined, and they must be to trust their fate to chance, they will attack as follows:

Die Roll	Action
1	Attack the target from the NW
2	Attack the target from the NE
3	Attack the target from the SW
4	Attack the target from the SE
5	Attack the nearest freeway offramp from the left
6	Attack the nearest freeway offramp from the right

The purpose of using dice is to get the civilian snipers to completely surround the target, regardless of local conditions. You can't just tell them to spread out. There must be some mechanism in place that automatically results in the snipers distributing themselves evenly around the target. Unless they roll dice, civilian snipers will invariably do one of two things"
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Jack Hinson's One-Man War, A Confederate Sniper