The battle starts out with White Base surrounded and it's up to you to take down the Attack Commanders that are there. Of course, things get a bit more complicated when more Attack Commanders show up in the southeast corner, so you need to head over there and make sure your allied fields don't get conquered. Once you take care of them, some Combat Engineers will appear in the northeast and start heading towards Jaburo Core.
So, you need to hurry up and take out those Combat Engineers and when you do, more will show up and go after White Base now. Hurry up to the White Base's position and remove the Combat Engineers before they deal heavy damage to it. When they are gone, some Gaws will appear and start supplying the battlefield with reinforcements.
Only one will appear at first, but another will appear afterwards and things can get a little bit hectic. You should have more than enough experience now dealing with the ships, so take them out how you wish. Around the same time or after downing both ships, an unknown unit shows up, which happens to be Char. He will be accompanied by some units named Royal Guard, but they are nothing special and the battle is over once Char is downed.