 Over the next month, Drake patrolled the Iberian coasts between Lisbon and Cape St. Vincent, intercepting and destroying ships on the Spanish supply lines.Drake estimated that he captured around 1600–1700 tons of barrel staves, enough to make 25,000 to for containing provisions.Drake was vice admiral in command of the English fleet (under Lord Howard of Effingham,) when it overcame the Spanish Armada that was attempting to invade England in 1588.