Two powerful fleets sailed from England for the Antilles; the one under the orders of Admiral Rodney attacked the French colonies and took Martinique, Granada, Santa Lucia, San Vicente, and Tabago; the other under Admiral Pocock appeared before Havana, June 2, 1762, with a fleet of 30 line-of-battle ships, 100 transports, and 14,000 landing troops under the command of the Earl of Albemarle. In four days the English took "la Cabaña," which Prado, the governor, considered the key to the city. For some unexplained reason the Spanish fleet became useless; but Captain Louis Velasco defended the Morro, and for two months and ten days he kept the English at bay, till they undermined the walls of the fort and blew them up. Then Prado capitulated (August 13), and Havana with its forts and defenses, with 60 leagues of territory to the west of the city, with $15,000,000, an immense quantity of naval and military stores, 9 line-of-battle ships and 3 frigates, was delivered into Albemarle's hands. It was Puerto Rico's turn next, and preparations were made for an attack, when the signing of the treaty of peace in Paris (February, 1763) averted the imminent danger. By the stipulations of that treaty England returned Havana and Manila[43] to Spain in exchange for Florida and some territories on the Mississippi; she also returned to France part of her conquered possessions. In 1778 Charles III joined France in a war against England, the motives for which, as explained by the king's minister, were frivolous in the extreme. The real reason was England's refusal to admit Spain as mediator in the differences with her North American colonies. This war lasted till 1783, and though the Antilles, as usual, became the principal scene of war, Puerto Rico happily escaped attack. Not so during the hostilities that broke out anew in consequence of Charles IV's offensive and defensive alliance with the French Republic, signed in San Ildefonso on the 18th of August, 1796. In February, 1797, Admiral Henry Harvey, with 60 ships, including transports and small craft, and from 6,000 to 7,000 troops under the orders of Sir Ralph Abercrombie, appeared before the island of Trinidad and took possession of it with but little resistance from the Spanish garrison. On the 17th of April the whole fleet appeared before San Juan.