ca. 1588-1589 "Armada" portrait by George Gower (detail) (private collection)
This is one of several "Armada" portraits of Queen Elizabeth of England celebrating the routing of the Spanish Armada. The Wikipedia article about the Spanish Armada can be found here.
The Armada was not defeated by English action - it was defeated by limitations of the ships being able to sail in adverse wind conditions. English ship design, seafaring skills, and tactics were important, but not decisive. The word "armada" now has particular meaning in English - a huge naval force composed of many, many ships that is more powerful than a mere "fleet."