I disagree -- the rules should be able to handle that situation, because it's a tactic many parties will try. If you're tasked with saving a town from a monster, it's quite reasonable to ask the townsfolk for help. And while the townsfolk can't be expected to charge suicidally into melee, a couple volleys of arrows from ambush while the PCs draw the beast's fire is a fair request.I don’t care about 100 guards vs 1 dragon.
The game is not meant for that.
Adding rules to confort war game simulation balance is an unnecessary burden.
Of course, the question then becomes, how well should these tactics work? As DM, I'm inclined to allow them to work but throw the PCs some challenges in execution. How many people can you rally to face the monster, and where are you getting the weapons? (Sure, bows are cheap by PC standards, but that doesn't mean you can just walk into the market and find a few hundred for sale.) Can you keep your archers from panicking and spoiling the ambush? How do you keep the monster from going after them, and can you convince them that you'll be able to?
Not every quest has to involve the PCs tackling a fearsome foe on their own. Heroes rallying the people to fight for themselves is another great story.
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