One of the most difficult levels to complete. However, it can be done. Here is the outline: Turn 1 take the two oil rigs lower left and lower right with your two Intrepid boats. You will not likely use the Intrepid boats again before the end game, except perhaps as sacrifices. You might not get to use your air units at all. Hold them back. Use them against free targets of opportunity, if any arise. Or use them as sacrifices if you have to. If you are careful, you should be able to move over onto the offensive and attack off of the island around round 15 - 20, on Normal difficulty level.