Hi Fate,
Quote Originally Posted by Fate
Firstly, when attacking a settlement, useing say onagars of heavy onagars, and the artillery hits civilian structures inside the settlement, does it cause casualties? I ask because in the past ive had huge portions of the city burn, but without a spy in the city i dont know the population level beforehand. this would be an effective way to reduce population ontop of the extermination.
Sadly, but it, unrealistically, does not. It does however, destroy buildings, yet only if you hit build-able buildings on the battle map. Otherwise it, unfortunately, does very little. Sorry.
Quote Originally Posted by Fate
Secondly, why are onagars so awkward to use when defending? i cant fire at units over the walls, but i can fire at siege towers etc, any idea why?
That is, sadly, a very nasty bug. I am not sure yet, I believe that it could have something to do with the fact that the great siege towers are very high up and that is where the mighty onagers aim for rather than on the ground in the case of units. Shame, yet there is nothing that can be done about it, sorry.

Sorry to be the bringer of bad news, cheers!