Originally posted by WillJ
#5 is still unanswered: Does anyone know the average success rates (%'s) of the bombard units? Or at least artillery (the one I'm worried about right now). I guess with knowing just one unit I could figure out the rest, assuming the bombard strength unit that they use is constant. (For example, a bombard strength of 4 is half as good as 8.)
OK, I'll have a got at that one....
Using any of the indirect fire units against a unit works just like regular combat, except that you only get as many 'rounds' as you have RoF for the firing unit, and the defender is the only unit to take hits.
So, cannon, bombard strength 8, RoF1, fires at musketman in the open, unfortified.
8 vs 4*1.1 : 8 vs 4.4 odds
So you should hit about 60% of the time (8/12.4, in fact)
Artillery in the same case would be 12 vs 4.4 and have 2 shots. So you'd have two independent 75% or so chances to knock off a hit point.
Always remembering there is 0% to take the last hit point unless the units have been given 'lethal bombard' capability.
Against improvements and cities its a bit more complex. I vaguely recall one of the more investigative members of the site doing a detailed check, and IIRC the odds kept moving around with each patch.
Attacking a tile improvement: there must be no units on the tile IIRC and the improvement is assigned a notional defensive value, which I can't find.
Attacking a city the attack is randomly chosen against citizens, defensive units of buildings. Citizens and buildings have a notional defense of 16. Even with multiple RoFs I've never taken out 2 citizens or two buildings in one shot, so one seems to be a per-fire limit there.
I believe it was determined that the odds were roughly 1:1:1 for the three target types, but that has changed with patches - it was 1:1:2 at one point I think. Even if there are no buildings left, you still have a chance of "targeting buildings" which then wastes the shot. Similarly, I don't believe you can kill the last citizen, so that can waste shots too.
I think TheNiceOne did the investigation, but that's a guess from hazy memory