The North Sea mission is in three parts. The first part is an island, the second part is another island and the third part is an all out assault on the Rising Sun’s base. This mission is done similar to previous missions where you need to work with the Russians. Your co-commander will assume this role as the Russians.
For the first island use the Russian commando’s special ability to snipe out the captains in the battleships. Then use the allied spies to take control of the battleships and destroy the radar ship. The mission leads you to believe you need to destroy the power plants on land immediately this is false.
Next part of the mission is the second island. For this you will use Tanya to remove infantry from the island. And the engineers to capture the power plants to take down the next set of guns. This should be done in steps. Infantry then take the plant, infantry then take the plant, repeat as necessary. Until you finally use Tanya to destroy the radar boat.
The third part is a full out assault on the Rising Sun’s floating base. This should be a longer mission. You are instructed to take out specific power reactors to assist in your attack. This is primarily a naval battle. The allies get aircraft carriers and bombers. The aircraft carriers will give you ranged weapons. The bombers will allow you to para-drop infantry, if you build the bases on land you can load infantry. You will want a good anti-air defense. Using several hydrofoils will help defend against air attacks. Set some of your hydrofoils to use their alternate weapon to disable enemy units. From here your own your own.