three quick questions

[jivemi]

Happy New Year SP fans. After scrupulously perusing the search function, here's a few nagging questions for your kind attention:

1) Will on-board artillery automatically fire counter-battery against enemy on-board artillery if you leave them alone, or do you have to do it manually?

2) Do forward observers gain experience simply by successfully directing arty fire?

3) How do you "sell" core units in a campaign? (I've been playing SP for years, and didn't know this was possible.)

Thanks and happy gaming!