Question on selling troops

[Warmskin]

So, you're saying there's no way to sell troops? You just have to dismiss them when you want to try a different type? Is there any way to have more than 5 different types, or is that maybe what the 'Garrison' is for? I really like the game, but as usual, the docs are really lacking in explaining exactly what's going on. I smell an 'Official Hint Guide' to clear everything up...