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Elizabeth didn’t want war with Spain
So she didn’t send enough resources
William Stanley and Robert York defected to the Spanish
Elizabeth wanted freedom for the Dutch but to still be ruled by Spain whereas Dudley wanted to completely free Spain
Dudley prevented Spanish from capturing the deep water ports in Oostende which became vital in the war as it prevented the Spanish from linking up with the Duke of Palma
However he could only cause problems for the duke of Palma never actually defeat him
Spain had to look to its own defences and resupply for a year
It gave England time to prepare for the armada in 1588b