Garrison and public order

Hi, i´ve decided to start a new NTW campaign playing as Prussia. I already played through the game a year or so back as France but there´s one point which I have always wondered about: How much public order points do garrisoned units generate? And is there a difference if they´re militia or real soldiers? Whats the difference between the "garrison" value and "city watch"? Back in MTW2 it was 1 point for 1 unit but its different in NTW.

I´ve raised the tax for the nobility in my first turn and moved troops but paid attention that public order wasnt lower than 0 in any region. Now I want to recruit as many militia troops as necessary to 1) be able to move out the rest of the expensive troops and 2)get a public order value of exactly 1 in each region, thats why I´m asking. Anybody figured that out? I´m playing on VH/VH btw, if that makes any difference.

Hello,
full stack army of cavalry, line infantry, cannons has garrison bonus of 10
full stack army of militia has garrison bonus of 15 (it can help on capital cities)
I guess that you needn't full stack of militia to get bonus of 15 but i haven't tried

I always keep happines on 0-2 lower classes and 2-4 higher classes even without militia in the town (on the hardest)
by lowering taxes and sending trade ships instead of it.