At length the Dutch government sent out Count Maurice of Nassau, to take the command at Pernambuco. He arrived in 1537, and carried on the war so vigorously that the Portuguese retired out of the province. He also set about reforming the abuses which existed among the Dutch themselves at Recife, and having established himself firmly there, he sent one of his officers, Jan Koin, over to the coast of Africa, who took possession of St. Jorge da Mina, by which a supply of slaves was secured, and leaving a garrison there, returned to Recife. The next year, Maurice made an unsuccessful attack on St. Salvador. His fleet anchored in the bay of Tapagipe; but though he obtained at first some important posts, he was finally repulsed and returned with loss to Pernambuco. There he occupied himself in building a new town, and making the two first bridges that had yet been built in Portuguese America, besides planting trees, and improving the fortifications. In 1640 he sent the famous sea-warrior Jol into the reconcave, to lay it waste; and he accordingly burnt the whole of the sugar-works in the bay, while the Indians who were friendly to the Dutch, fell on the land-side of the captaincy, and harassed the unhappy settlers in an equal degree. At length the court of Madrid began to be alarmed for the safety of Brazil, and fitted out a large armament for its relief. Storms and sickness diminished it, ere it arrived, to nearly one half. That half arrived at Bahia, in 1640, under D. Jorge de Mascasentras, Marques de Monte Alvam. Before he had time either to make open war, or to negociate, the revolution in Portugal, which placed Braganza on the throne of his ancestors, took place. The viceroy, unjustly suspected of adhering to Spain, was sent home, and a commission, composed of Barbalho, Correa, and the bishop, appointed in his stead. One of the first acts of the restored Portuguese government was to make a ten years' truce with the Seven United States. But this did not prevent the continuance of hostilities in Brazil, and the other foreign possessions of Portugal. Serigipe was surprised, Maranham conquered, and Loanda in Angola and St. Thomas's taken. Notwithstanding these successes, the Dutch government disapproved of Count Maurice's administration. Instead of sending home either to the States or the Company all the money and produce which he had gained in Brazil, he had laid out great part of it, as well as of his private fortune, in fortifying the mouths of rivers and harbours, particularly Recife, in repairing and beautifying the towns, and in other public works, which, looking forward to the permanent establishment of the Dutch in the country, he considered as absolutely necessary. He was accordingly recalled, and returned to Holland in 1644. After the departure of Maurice the tyranny of the Dutch became so intolerable, that the Portuguese began to rise against it almost universally.