Spanish Armada, also called Armada or Invincible Armada, Spanish Armada Española or Armada Invencible, the great fleet sent by King Philip II of Spain in 1588 to invade England in conjunction with a Spanish army from Flanders. They wern't as invincable as said though, because they were defeated. It is said to be caused by disease and foul weather mostly, but its defeat was nevertheless a triumphant military victory for England. By fending off the Spanish fleet, the island nation saved itself from invasion and won recognition as one of Europe's most fearsome sea powers.