Uses of Indie Soldiers?

[Arryn]

Playing as R'leyh, I don't find knights to be all that useful. Given a choice of spending gold on them versus buying more illithids, I choose illithids. For frontline grunt troops I prefer summons (sea trolls are my favorite, and vine ogres are always handy) or shamblers. For wetwork, hordes of cheap tritons are useful.

Being a magically strong -- and aquatic -- nation whose best units cannot be recruited on land, R'leyh doesn't benefit as much from a fortification-indies strategy as other nations do. The squiddies have more (and typically better) options open to them. IMO.