The scenarios in Carrier Strike roughly reflect the changing strengths of the US and Japan as the war progressed tilting the balance of power increasingly towards the US as the game continues. In the campaign the Japanese should aim to destroy the US carriers as quickly as possible because in 1940 the US has only six carriers against Japan's ten. Using large numbers of bombers in a few attacks is more effective than using a couple or three bombers at a time in wave after wave of attack. It takes about 50 bombers with 500lb bombs or torpedoes to sink an aircraft carrier - the same amount of ordnance can inflict heavy damage on two carriers but if you're playing Japan you're at a bit of a disadvantage because the US flak has a larger range. A small compensation for this is that the Japanese forces have the wind behind them which means Japanese carriers don't have to manoeuvre into the correct position to enable the planes to take off