Meanwhile the Dutch had made preparations for an advance up the Kwanza. They had built Fort Mols at the mouth of the river, and another fort higher up. The Governor, Francisco de Sotto-maior, having died of fever in May, 1646, measures for a spirited defence were taken by the three captains-major, Bartholomeu de Vasconcellos da Cunha, Antonio Teixeira de Mendonça, and João Juzarte de Andrada. Muchima, which had been furiously assaulted by the Dutch, was relieved by Diogo Gomes de Morales. But in the following year the Portuguese suffered a reverse at Kawala (Caoalla), and Masanganu itself was threatened by the combined forces of Queen Nzinga, Kongo, and the Dutch. However a saviour was at hand in this extremity. On August 12th, 1648, Salvador Corrêa de Sá Benevides,[489] with nineteen vessels, having on board nine hundred soldiers, cast anchor in the harbour of Luandu, and summoned the Dutch to surrender within forty-eight hours. On their refusal he landed his troops, and after a short bombardment of Fort S. Miguel, to which the Dutch had withdrawn, early on August 15th he delivered an assault, which cost him one hundred and sixty three men, but led to the surrender of a garrison numbering one thousand one hundred men, including French and German mercenaries. When these prisoners had been joined by the three hundred Dutchmen who were with Queen Nzinga, and the garrison of Benguella, which surrendered without a blow, they were shipped off to Europe. The city, in memory of the event, assumed the name of “S. Paulo da Assumpção de Loanda,” for it was on the Day of Ascension of the Virgin Mary that a seven years’ captivity ended. The anniversary of that event is celebrated to the present day by a religious procession. RESTORATION OF PORTUGUESE AUTHORITY. No time was lost in restoring the authority of Portugal throughout the colony. The King of Kongo was compelled to accept a treaty by which Luandu Island and the whole of the country to the south of the Dande river were unconditionally surrendered, and other advantages held out (p. 128). Queen Nzinga, although she declined the overtures of Captain Ruy Pegado[490] for a formal treaty, retired inland, and gave no trouble for a number of years. As to the sobas of Lamba, Kisama, Lubolo, and the Modiku islands, they were visited by punitive expeditions commanded by Antonio Teixeira de Moraes, Diogo Mendes de Morales, Vicente Pegado de Pontes, and Francisco de Aguiar. Order having been restored, the Governor, Salvador Corrêa de Sá, caused the ruined buildings to be repaired, and granted crownland to the inhabitants for houses and gardens. In a very short time prosperity returned, and the trade of Luandu was as flourishing as ever it had been.[491]