Army Size of Different Villains.

[The Skarzs]

. .  This is awkward.

[Ashleg]

WHAT, IT'S TRUE.

[Krantor the Brutal]

No, look at Veil and Klitch and Gruven and that Painted One rat from Doomwyte. No siblings.

But the fathers don't seem to stay with the wives, either.

I think they just have children, a lot, in separate situations.

True...

[The Skarzs]

Polygamists. Okay.

But still, where would they come from? The mysterious north where it is supposed to be harsh and trying to live there is hard? South of Southsward where we know nothing of?

[DelenatheWanderer]

Hello everyone! It's Delena, wannabe professor of animal mannerisms! would anyone like to hear a lecture about the way every species in Redwall lives their life!?!?!?
No?!
Fine.

[Ashleg]

Polygamists. Okay.

But still, where would they come from? The mysterious north where it is supposed to be harsh and trying to live there is hard? South of Southsward where we know nothing of?

East, north, west, south, tropical islands nobeast's heard of (seems to be common).

[Maudie]

Eh, polygamy? Nah, doesn't sound right. There would be some mention of it in the books, I think. As far as I remember there is actually zero supporting evidence for this theory.

But then I could be wrong.

Anyways, maybe there aren't more vermin. Maybe they just tend to be more gregarious than goodbeasts and you tend to see larger numbers of them together. Or maybe there are more vermin because they are more gregarious and therefore more likely to find a mate.

[The Skarzs]

That's a potential answer too.

[Ashleg]

Kurdley had multiple wives.

[The Skarzs]

He was also described as being a savage, primitive.

[Ashleg]

So are most of them.

But I don't think it's polygamy. I just think they (usually) don't choose permanent mate(s).

[clunylooney]

Here are the actual numbers:

Blue Hordes: 7500
Corpsemakers: 4000
Rapscallions: 1000
Brownrats: about 900
Foxwolf Horde: 800
Gabool's Corsairs: 640
Cluny's Horde: 600
Sea Rogues: about 500
Thousand Eye Army: 400-500
Marlfox Horde: 400
Bloodwake's crew: 350
Wave Brethren: 320
Juskabor: 300
Kharanjul's Horde: 300
Ravagers: 200
Feral Cat Army of Green Isle: 200
Vizka Longtooth's Crew: 150
Gulo's Horde: 100
Grullba Deathwind's Horde: 100
The Darrat: 100
Ravetail's Horde: 100
Bane's Mercenaries: 60
Raga Bol's crew: 50
Streamrats: 30
Slagar''s Band: 20 
Burrad's Band: 12
Groffgut's Gang: 8
Driftail's Gang: 8
Sholabar's Band: 5 
Wicky's Band: 3

[Sebias of Redwall]

Ooh, great list! Btw, how did ya find the numbers of the Blue Hordes? I'm curious cuz I tried to find the exact number before and didn't remember finding any, lol. Did they mention it in Lord Brocktree?