Do general pips, unit pips, etc. apply to assaults?

[Mindel]

It's never been clear to me which combat modifiers such as general pips, unit pips, infantry combat ability, discipline, etc. apply when assaulting a fort. Has anyone ever sat down to test this out and find the answer? Or maybe a dev can tell us the answer.

I personally think that general siege pips should also play a role, but I have no idea whether they already do.