succesful assault

[unmerged(25223)]

If no siege bonus is listed, that's because there is none (i.e. siege bonus=0). Siege bonuses are relatively rare, and most of the leaders who have a siege bonus have only a 1.

Well, that's a relief - I'm not going nuts!
It's a bit confusing, though ... it shows a "bonus" of 0 for fire/shock as appropriate, but not for siege. Am I looking in the right place? I assume I should be looking near the M/F/S bonuses - is that right?

 

[unmerged(21523)]

If your leader has a siege bonus, it'll be displayed right after the shock value. Presumably zero is such a common number for siege bonus that the game omits the siege value if it's zero.

 

[Nikolai II]

Well, that's a relief - I'm not going nuts!
It's a bit confusing, though ... it shows a "bonus" of 0 for fire/shock as appropriate, but not for siege. Am I looking in the right place? I assume I should be looking near the M/F/S bonuses - is that right?

Load up a game as Venice or Knights (of St.John). Their default leaders have siege, so you will quickly see what it is all about.