The Struggle For Freedom.
A Nation Rises.
You might get nervous from first glance of the level, but the trick to beating it is quite simple.
The Sun Barricade must survive since you can't build another.
At the very start Bridge from your Stone Tower straight across in a line right next to the enemies Thunder Cannons. Go right next to them and keep bridging in that line until you get close to his island. Once you have done this go to the top of your island and bridge the same way as the bottom.
After that key step has been completed, bridge around his island like you have done in the past levels so that he can't expand. When you're bridging around his island remember that the closer you are to it, the less room he has to expand.
As soon as his island is completely surrounded by bridges you can relax since he can't harm your island any more. Start mining by connecting to Storm Geysers and collecting with Golems. Obtain a fair amount of money then kill his island. You can begin by killing off a few middle cannons for extra money.
It's a good idea to destroy the computer's Workshops before attacking his Temple since it's easier and he won't be able to attack back after you destroy them. If you fail during your first attacks and the computer get a good defense up around the workshops, you can simply destroy his temple.
You won't be able to Sacrifice his Priest since you don't have any room to build an Altar. Unless you killed the front attacking force at the start you have to do it now before you can build your altar, else the thunder cannons will destroy it.