Hard Difficulty
This mission is incredibly easy, as Mini-Gunners are made to blast aircraft out of the sky. Apart from civilian structures, Fortified Bunkers will also aid in defense. Gattling Cannons however are cheaper to set up, and therefore must be relied on earlier in the game since they can also uncover enemy Stealth Fighters.
Once you have a stable defensive perimeter of anti air up around your base, start teching up. The first thing you should upgrade is the Chain Guns upgrade to improve Gattling Cannons' damage. Then build a Propaganda Center, Internet Center and a Nuclear Missile.
Build a Black Lotus, one or two Dragon tanks (don't forget the upgrade) and three Assault Troop Transports. Take all of those units and move towards the center of town. Use Black Lotus to scout ahead, use the Dragon tank to take out garrisoned buildings, and use the Troop Transports to defend the Dragon tanks from land and air attacks (though the only land attacks are a few extra infantry from the center of town.) If you are quick enough you will easily take out his supply choppers before he empties the center supply dock. This will strangle his economy. He will of course retaliate (by air) but your troop crawlers should be up to the task of defense; if one or two get killed, have the troops garrison a nearby building.
You should now be softening up his defenses with your Nuclear Missile and Artillery barrage General Power. Build a few Inferno Cannons and/or Nuke Cannons along with a large force of troop crawlers. Artillery units can wipe out the Patriots, allowing the Assault Troop Transports to safely advance.