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How was the Armada defeated?

It was bad luck, bad tactics and bad weather that defeated the Spanish Armada.
— Robert Hutchinson, Historian - ±«Óătv History Magazine

Bad weather was certainly one factor that contributed to the Spanish defeat, but there were other factors too.

FactorDetail
LeadersThe Duke of Medina Sidonia led the Spanish fleet, but he was inexperienced in naval battle and so made some fatal errors in his planning and tactics.
PlanningThe strength of the Spanish fleet came from its crescent formation plan – but when the English broke this up with their fire ships, the Spanish became vulnerable and exposed to attack.
No reinforcementsThe Spanish plan relied on stopping to pick up the Duke of Parma’s army to boost their numbers, but the fleet was unable to anchor and so never picked them up.
TacticsSpanish tactics were to get close enough to English ships to board them, whereas the English tactic was to attack from a safe distance.
ShipsSpanish ships were slower and less equipped for the bad weather than the English ships.
WeaponsThe English ships had cannon they could fire at a safe distance and could be reloaded quickly. The design of the Spanish cannon meant that they could only fire over short distances and were slow to re-load.
WeatherThe lack of a secure port where the Spanish could take shelter meant that the Spanish ships were buffeted by the wind. The thinking was that God intervened and the windy weather was a sign that God was on Elizabeth’s side.
FactorLeaders
DetailThe Duke of Medina Sidonia led the Spanish fleet, but he was inexperienced in naval battle and so made some fatal errors in his planning and tactics.
FactorPlanning
DetailThe strength of the Spanish fleet came from its crescent formation plan – but when the English broke this up with their fire ships, the Spanish became vulnerable and exposed to attack.
FactorNo reinforcements
DetailThe Spanish plan relied on stopping to pick up the Duke of Parma’s army to boost their numbers, but the fleet was unable to anchor and so never picked them up.
FactorTactics
DetailSpanish tactics were to get close enough to English ships to board them, whereas the English tactic was to attack from a safe distance.
FactorShips
DetailSpanish ships were slower and less equipped for the bad weather than the English ships.
FactorWeapons
DetailThe English ships had cannon they could fire at a safe distance and could be reloaded quickly. The design of the Spanish cannon meant that they could only fire over short distances and were slow to re-load.
FactorWeather
DetailThe lack of a secure port where the Spanish could take shelter meant that the Spanish ships were buffeted by the wind. The thinking was that God intervened and the windy weather was a sign that God was on Elizabeth’s side.