Command & Conquer: Red Alert 3/Santa Monica

After you get your Conyard, build power barracks refinery power refinery war factory Place all power in sea where the lasers will protect it.

Build up engineers, capture derrick above you, capture derrick to the southeast (right of you). Avoid the mirage tank guarding the area to keep your engineers safe.

Place an engineer near the airport tower (ready to capture when you get the secondary objective).

Capture the allied bases directly to the north of you and the air base on the right. You will need some antitank infantry to take care of the turrets.

Capturing all this will significantly reduce the enemy's capability to assault your position.

Build a mixture of forces for defending your base all the time. Use special powers on the observatory to give your ally breathing space.

Take it slowly from there by eliminating the other allied bases and capturing the media centers. You can build allied units after capturing one of their construction yards.

Tips

 * Build everything on sea except barracks and war factory and defences
 * Use engineers in the beginning to capture various bases