Stoat in Bifröst

During a Bifröst run with the Stoat, if he gets the conquest bonus that buffs his Marches of Brittany so all sentries don't cost warband or population lore, alongside the Pillar of Glory bonus for 3 free warband units, he can eventually end up recruiting an army that dwarfs any other possible without any issues.

I just got through a run with a friend of mine, and his total army size during the last fight against Gullveig was at 200 sentries - all recruited entirely for free and costing neither warband nor population, and I don't recall any of his conquest bonuses just making them free, only that they don't cost any pop and warband.

So I'm guessing it's the 3 free warband units from the Pillar of Glory you can find over the course of a run, that doesn't mesh well with, potentially only, Marches of Brittany as a whole.