Town / City / Metro bonusses

[Theov]

Right now the defense bonuses to defend a town/city/metro are distributed like this:
Town: 0
City: 50
Metro: 100.
Citizen: 16
Building: 16

Meaning a unit defending a 1-6 town gets no bonus, 7-12 gets 50% bonus and in a metro (13 and over) he gets a 100% bonus.

Are cities too easy to take? Shouldn't they upheld a marching army a bit more?
I was thinking about:
Town: 50
City: 100
Metro: 150.

I mean city warfare over the course of history has been brutal. And it balances things a bit so run-away civs don't run away that easily.

Brings me to this thing in the editor:

Citizen: 16
Building: 16

I found a thread that explains it (I think) but the pictures are dead.
https://forums.civfanatics.com/threads/editor-citizen-building-defensive-bonus.29298/

Anyone knows what it means?

 

[Bluemofia]

It is the % defense bonus a citizen or individual building gives. However, this is what the editor says, I didn't do a thorough test myself to confirm it, but it is reasonable.

If the bonus is 16, in a city of size 10, the population alone gives a bonus of 160% to the defenders.

Now, how this stacks with Town/City/Metro, if at all, I don't know for sure. I assume it is additive, so a city of 10 citizens, and 5 improvements has a defense bonus of 160+50+80 = 290%. This means a 6/10/1 Infantry fortified in this city on grassland without a river benefit will have a defense of 290+25+10 =325% (25% fortification, 10% on grassland), so an effective defense of 32.5 compared to the attack values of the enemy. If the enemy is attacking with a tank with 16 attack, the Infantry would win 67% of the battles, so lose 1 HP for every 2 of the Tank's HP on average.

Again, I haven't tested this to prove it either way (easy to do so, though time consuming. Run 1000 or so individual battles and compare the results to what statistically would have happened), but that's what my understanding of this is.

 

[tom2050]

Those numbers effect bombardment of citizens and improvements.

Raising that number up makes it more difficult for citizens in a city to be destroyed, or for improvements (including walls and coastal fortress) to be destroyed.

Even for a ship e.g. 4 bombard str, RoF 3.. it hits a 16 building defensive strength pretty quickly and will destroy 'coastal fortress'. Same with a 'walls' improvement to a catapult. (can also destroy any other improvement, except for I believe small wonders/wonders but not sure)
In some of my mods, I up those numbers just a bit, to make those structures provide a bit more lasting power.

 

[Bluemofia]

@tom2050 if a small or great wonder has bombardment defense values of its own, it can be destroyed by artillery fire. I've confirmed this in one of my test sessions.

From what I understand, improvements with bombardment defense are the first ones targeted when they are being bombarded, aside from those that are provided for free, for example from The Great Wall wonder.

Also, you may be right about the bombardment defense strength. I haven't done the tests myself, so I'll defer to your explanation.