Butler returned to England in 1640, satisfied that the fortifications were adequate, deputizing the governorship to Captain Andrew Carter. In 1640, don Melchor de Aguilera, Governor and Captain-General of Cartagena, resolved to remove the intolerable infestation of pirates on the island. Taking advantage of having infantry from Castile and Portugal wintering in his port, he dispatched six hundred armed Spaniards from the fleet and the presidio, and two hundred black and mulatto militiamen under the leadership of don Antonio Maldonado y Tejada, his Sergeant Major, in six small frigates and a galleon. The troops were landed on the island, and a fierce fight ensued. The Spanish were forced to withdraw when a gale blew up and threatened their ships. Carter had the Spanish prisoners executed. When the Puritan leaders protested against this brutality, Carter sent four of them home in chains. The Spanish acted decisively to avenge their defeat. General Francisco Díaz Pimienta was given orders by King Philip IV of Spain, and sailed from Cartagena to Providence with seven large ships, four pinnaces, 1,400 soldiers and 600 seamen, arriving on 19 May 1641. At first, Pimienta planned to attack the poorly defended east side, and the English rushed there to improvise defenses. With the winds against him, Pimienta changed plans and made for the main New Westminster harbor and launched his attack on 24 May. He held back his large ships to avoid damage, and used the pinnaces to attack the forts. The Spanish troops quickly gained control, and once the forts saw the Spanish flag flying over the governor's house, they began negotiations for surrender. On 25 May 1641, Pimienta formally took possession and celebrated mass in the church. The Spanish took sixty guns, and captured the 350 settlers who remained on the island – others had escaped to the Mosquito Coast. They took the prisoners to Cartagena. The women and children were given a passage back to England. The Spanish found gold, indigo, cochineal and six hundred black slaves on the island, worth a total of 500,000 ducats, some of the accumulated booty from the English raids. Rather than destroy the defenses, as instructed, Pimienta left a small garrison of 150 men to hold the island and prevent occupation by the Dutch. Later that year, Captain John Humphrey, who had been chosen to succeed Captain Butler as governor, arrived with a large group of dissatisfied settlers from New England.