Can coalition members garrison your provinces?

#1 No > Probability is that your low morale newly taken province would revolt and claim loyalty to your coalition mates country if he has units sitting there in the low morale province.

#2 No> BONUS GUESS in my experience, even units sitting together / not moving, a naked arty is vulnerable and could die of splash damage itself , yes for melee your mate could position himself between your enemy and your arty to avoid arty taking melee damage... I say "sitting together' because you also have movement issue even on coalition mates territory of 70% movement speed while his units move at 100% It certainly would be a bonus if your coalition mates units could serve as a meat shield, but I have not seen it.

Well that's disappointing, and pretty silly IMO, if you are a member of a coalition ANY coalition member should be able to garrison your conquests.

Bummer on the meatshield answer too, but it is what it is. Thanks for the response.

If they garrison it, then if they backstab, then say goodbye to your provinces