Walkthrough for the "Tribes of the East" expansion.

guys, how do you take out the central mega castle in mission 4? Can anyone share their strategy?

Added 33 minutes ago

guys, how do you take out the central mega castle in the last mission of the campaign? Can anyone share their strategy?

I also have a weird bug where the Gothai keeps running around the map and gets stuck, unable to go down into the dungeon.