Counter battery fire question

[raginis]

I checked the manual (Ctrl+F "counter") and did a search on the forum, but I still have a question about counter battery fire:

1. On-board artillery
a) Does it ever counter-battery fire against other on-board artillery (or is the player expected to plot those missions)?
b) Does it ever counter-battery fire against off-board artillery (and does it matter if the on-board artillery has the 200+ range)?

2. Off-board artillery
a) Does it ever counter-battery fire against on-board artillery?
b) Does it ever counter-battery fire against off-board artillery?

The answer to the last two seems to be yes, but I'm asking just to have 100% clarification.

I understand the rules about leaving the artillery idle, having high enough experience etc. as those are spelled out in the manual.