In 1596, Raleigh took part in the capture of Cádiz, where he was wounded. He also served as the rear admiral (a principal command) of the Islands Voyage to the Azores in 1597.[41] On his return from the Azores, Raleigh helped England defend itself against the major threat of the 3rd Spanish Armada during the autumn of 1597. The Armada was dispersed in the Channel and later was devastated by a storm off Ireland. Lord Howard of Effingham and Raleigh were able to organise a fleet that resulted in the capture of a Spanish ship in retreat carrying vital information regarding the Spanish plans.
In 1597 Raleigh was chosen as member of parliament for Dorset and in 1601 for Cornwall.[19] He was unique in the Elizabethan period in sitting for three counties.[4]
From 1600 to 1603, as governor of the Channel Island of Jersey, Raleigh modernised its defences. This included the construction of a new fort protecting the approaches to Saint Helier, Fort Isabella Bellissima, or Elizabeth Castle.