Role-playing Games Stack Exchange is a question and answer site for gamemasters and players of tabletop, paper-and-pencil role-playing games. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm planning for a Mouse Guard game that will culminate in the players facing down a bear!

The rules cover this far too briefly, only stating that you need 20,000 mice to do so (via the War skill). This seems like far too few mice to wage war on a bear, also how would this even be done? Are the mice laying seige to the bear, or are they marching on it? Do you even use War? Could a single mouse, climb the bear, insert itself into the ear and assassinate the bear?

I realise that this is a task for the players to decide on but I want to prepare for the circumstances.

How do you kill a bear with mice? (and how can I prepare for this?)

share|improve this question
up vote 8 down vote accepted

Ooh, fun question. I'm having trouble even picturing 20,000 mice, but quick Googling lists the weight of a bear as 300 - 780 kg and the weight of a mouse as 16 - 27 grams, so to compare against a bear in terms of weight the mice would need numbers between 13,000 and 50,000. Frankly, even if this worked though, the number of casualties involved in such a fight would be such that I'd be rather disgusted with the mentality of the party who considered it a good idea. Maybe if they didn't know it was coming and that was their only option it might be reasonable, but that would require you to be writing your campaign using the Final Fantasy IX school of plot.

Assuming they can plan however, some kind of trap would be the approach I'd expect almost any party to take. Given the small stature of a mouse, their best bet would likely be to use nature and their environment against their enemy. The most obvious things that spring to mind would be knocking it off a cliff, dropping something heavy on it, or causing something else (a poisonous snake seems the most obvious choice) to attack it for them.

With that in mind, I don't think this really requires much prep work as a GM. The ball is very much in the players' court with this one; all you really need to do is try to spot any obvious flaws in whatever plan they go with as they come up with it, and make it fail if you don't think they've done a good enough job accounting for these flaws. If they're anything like most parties I've seen in such situations, they'll spend a whole session planning giving you plenty of time before the next session to think about how their plan will play out and where any weaknesses may lie.

share|improve this answer
Remember, the Scientist skill is used to make bear-traps! – GMJoe May 9 '12 at 6:10

A mouse can not kill a bear by force of arms. At least, not using Fighter nor Hunter. (See the size effect rules on page 223-225)

Animals that are two or more ranks higher than you on the scale may not be killed by your hand—not using Fighter or Hunter.

Use of Militarist requires more than 1 mouse. For a black bear, 6 steps up the scale, it's 20,000 mice. (p. 223, right col)

Use of Scientist is another matter... and while more accomplishable, is still likely to result in a dead mouse.

A bear cub, the smaller ones being equivalent size to a large racoon, requires only a few hundred mice...

So, a single mouse can, at best, be a nuisance.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.