I started attack with this steps:
1. I make a lot of army in there squads (one for keeping base and two for attack)
2. recharge sheild and activate auto defence
3.send a spy and spread virus
4.get finaly all scans
5.fire jon lasser to target
6.fire missile if you have it
7.send a first squad
8.if you win then you complete the mission
9. if you don't then send other attack (squad 2)
10.if you win finish, if you don't then you are death.....
PS: And to now, I tried this and become conquested so it aren't working.....
If you have any comment then feel free to write it.