Work on the fortifications of the island was actively pursued during the administration of Gamboa. It was ordered that el Morro should have a garrison of two hundred, and that as soon as feasible, la Punta and la Fuerza were to be garrisoned by one hundred men each. The construction of the fort at the entrance to the port of Santiago de Cuba was an important improvement. It was called San Pedro de la Rocca, in honor of the governor of that city, D. Pedro de la Rocca, although it is generally known as the Morro. A garrison was installed, consisting of one hundred and fifty men sent from the Peninsula, and the ammunition destined for the defense came from New Spain. The power of the armadilla, which had theretofore been arbitrary, was also regulated at this time. Governor Gamboa, however, retired from office on the fifteenth of September, 1639, when he had barely inaugurated these improvements, and sailed for Spain. Gamboa's successor was D. Alvaro de Luna y Sarmiento, a knight of the Order of Alcantara. During his administration, which began on the fifteenth of September, 1639, and ended on the twenty-ninth of September, 1647, the work of constructing defenses was eagerly pushed. Two leagues leeward of Chorrera a fort was erected. At the mouths of the rivers Casiguagas and Cojimar were built the two towers that had been planned by Governor Viamonte; they were intended to protect those advanced points of the capital. The able engineer Bautista Antonelli superintended the construction of these works of fortification. As the cost of these structures was defrayed by the inhabitants of the city, the governor saw fit to entrust their defense to three companies of men recruited from the native population. It was the first regiment of the kind organized on the island. By January of the next year the fortifications of the Castillo del Morro were also completed. With the insurrection of Portugal which occurred at this period the pirates became bolder and renewed their outrages. The Dutch, too, threatened Havana once more. A squadron commanded by Admiral Fels had approached close to the coast, but had been driven back by a violent hurricane. Four of the vessels had been left between Havana and Mariel. Governor Luna sent Major Lucas de Caravajal against them; three hundred Dutch were taken prisoners, and seventeen bronze cannon, forty-eight iron cannons, two pedreros (swivel guns) and a great stock of arms and ammunition were captured. The captured pieces served to reenforce the artillery of the forts of La Punta and Morro.