Okay, I'm at what I think is the end of the Midway Mission, I took out what enemy planes I could then I took out the carriers, next, the red target arrow want's me to engage the enemy planes again but during that, the game says, take out the remaining destroyers which are hard to see due to the smoke. I finally find them, take them out and then what? more enemy airplanes? the time runs out and the mission fails. I can't get any further in this game until I accomplish this mission, please help!!

Get the destroyers (sink em)
and sink all other ships, even the carriers.