While these centres of trade and population were being formed in the very heart of the Spanish seas, the privateers were not altogether idle. To the treaty of Vervins between France and Spain in 1598 had been added a secret restrictive article whereby it was agreed that the peace should not hold good south of the Tropic of Cancer and west of the meridian of the Azores. Beyond these two lines (called "les lignes de l'enclos des Amities") French and Spanish ships might attack each other and take fair prize as in open war. The ministers of Henry IV. communicated this restriction verbally to the merchants of the ports, and soon private men-of-war from Dieppe, Havre and St. Malo flocked to the western seas.[59] Ships loaded with contraband goods no longer sailed for the Indies unless armed ready to engage all comers, and many ship-captains renounced trade altogether for the more profitable and exciting occupation of privateering. In the early years of the seventeenth century, moreover, Dutch fleets harassed the coasts of Chile and Peru,[60] while in Brazil[61] and the West Indies a second "Pie de Palo," this time the Dutch admiral, Piet Heyn, was proving a scourge to the Spaniards. Heyn was employed by the Dutch West India Company, which from the year 1623 onwards, carried the Spanish war into the transmarine possessions of Spain and Portugal. With a fleet composed of twenty-six ships and 3300 men, of which he was vice-admiral, he greatly distinguished himself at the capture of Bahia, the seat of Portuguese power in Brazil. Similar expeditions were sent out annually, and brought back the rich spoils of the South American colonies. Within two years the extraordinary number of eighty ships, with 1500 cannon and over 9000 sailors and soldiers, were despatched to American seas, and although Bahia was soon retaken, the Dutch for a time occupied Pernambuco, as well as San Juan de Porto Rico in the West Indies.[62] In 1628 Piet Heyn was in command of a squadron designed to intercept the plate fleet which sailed every year from Vera Cruz to Spain. With thirty-one ships, 700 cannon and nearly 3000 men he cruised along the northern coast of Cuba, and on 8th September fell in with his quarry near Cape San Antonio. The Spaniards made a running fight along the coast until they reached the Matanzas River near Havana, into which they turned with the object of running the great-bellied galleons aground and escaping with what treasure they could. The Dutch followed, however, and most of the rich cargo was diverted into the coffers of the Dutch West India Company. The gold, silver, indigo, sugar and logwood were sold in the Netherlands for fifteen million guilders, and the company was enabled to distribute to its shareholders the unprecedented dividend of 50 per cent. It was an exploit which two generations of English mariners had attempted in vain, and the unfortunate Spanish general, Don Juan de Benavides, on his