This campaign starts very different from prior campaigns. No more mollycoddling the beginning missions. From the get go, Missions 1 is recommended for HQ4+. It's a defense mission, which I find easier than the rest. Here are the video walkthroughs. Enjoy and good luck.
Secret Alliances - Mission 1 (3 Stars)
Sorry there's no sound. Fixed going forward. Did not anticipate Yosemite upgrade issues.http://youtu.be/qcBOHCvF4Ns
Secret Alliances - Mission 2 (3 Stars)http://youtu.be/p4HD_JHFx6Q
Secret Alliances - Mission 3 (3 Stars)http://youtu.be/LjU7GJkZFSk
I am HQ 6 for this Campaign. I decided to stay at HQ6 because most of you are probably not at HQ8 yet. Wookies and troops are upgraded to 6, but rest of my units are still on 5. Hopefully you can 3 star these missions with this guide. Good luck.