Tielby
Prince
TXT_KEY_UNIT_CANNOT_PROTECT_CITY said "Unit cannot defend cities", but , for example, a skeleton can defend his city against an enemy attacker.
I added this tag with the intention to describe "Can not Keep Peace and Order of Cities".
This means that a skeleton can not quash concerned citizen with no military unit, or a probability of city revolt. (And can not grant happiness from Social Order.)
I believe that current description may give a false impression.
But my native language is not english. How do you think?
I've noticed the same thing and I agree that the text is misleading... and I'm an English teacher, if that proves anything.

although you're right about culture win, in FFH it's way harder to get culture... perhaps too hard 

No, it isn't Barnaxus fighting the barbs, the Kurio worker, or a random acolyte. But all long time readers of the bug thread got it right on their first guess, it is indeed, (drum roll), the summon tiger bug.