 Complete the following phrase:  The Spanish Main became a frequent target for pirates, buccaneers, privateers and countries at war with Spain, seeking to capture some of these riches. To protect this wealth, the Spanish treasure fleet was equipped with heavily armed galleons. The organization of the fleets in large convoys proved highly successful, with only a few successful examples of major privateer attacks along the Spanish Main, such as the capture of Cartagena de Indias by Francis Drake in 1586; the 