Necessity is the mother of…

The Razzle Dazzle.

Whut?

From Twisted Sifter:

You’re the Fleet Admiral of the Navy in World War I. Your ships are being sunk at an alarming rate by the devastatingly effective German U-Boat. The traditional camouflage isn’t working because your environment (sea and sky) changes with the weather. What do you do?

You hit them with The Razzle Dazzle.