The newly appointed governor, Field-marshal D. Juan Montano Velasquez, was inaugurated in June, 1655, but dying within a year, did not vitally influence the course of affairs in the island. His plan of fortifying Havana consisted in enclosing the city with walls from the landside, running a rampart with ten bastions and two half-bastions. For the execution of this plan the neighborhood of Havana offered to contribute nine thousand peons (day-laborers) and the town corporation imposed a tax on every pint of wine sold to assist in defraying the expenses of the construction. The king approved heartily of these offers and ordered that the treasury of Mexico should aid by an additional contribution of twenty-thousand pesos. But the historian Arrato reports that the whole scheme was soon after abandoned on account of the war in which Spain was about to be involved. The British, their appetite for colonial possessions once being awakened, saw in the growing weakness of Spain an opportunity to get hold of some of her dominions. It was well known that Cromwell, although England was then at peace with Spain, tried hard to increase and strengthen its political and commercial power in America. The British had already conquered the islands Barbadoes and San Cristobal, and in the year 1655 a squadron of fifty-six vessels and a great number of transports sailed from England, determined to wrest from Spain more of her West Indian possessions. A force of nine thousand men was on these vessels, many of them filibusters who had joined the British. The British command had primarily in view the conquest of Santo Domingo; but, being repelled, it concentrated its efforts upon Jamaica. The governor and his people stubbornly resisted the inroads of the enemy. In the desperate struggle with a superior and well-trained force two brave land-holders distinguished themselves by their heroism: D. Francisco Proenza and D. Cristobal de Isasi. But their small and poorly equipped forces were outnumbered by the numerous and well prepared enemy; they were finally obliged to retire within the fortified camp and to surrender the place to the British invaders. Panic-stricken and unwilling to live under the rule of the enemy, thousands of Jamaicans left for Cuba. The population of this island having been recently decimated by the great epidemic, the refugees were warmly welcomed. They numbered about ten thousand and the population of Cuba increased, until it was estimated at forty thousand. This, however, did not compensate Cuba for the loss of Jamaica, which in time became as valuable to the British as it became ruinous to Spanish commerce.