to 1674 when they briefly retook the city during the Third Anglo-Dutch War, and by the late 1600s the wall encircled most of the city and had two large stone bastions on the northern side. The Dutch named these bastions "Hollandia" and "Zeelandia" after the ships that carried their invasion force. The wall started at Hanover Square on Pearl Street, which was the shoreline at that time, crossed the Indian path that the Dutch called Heeren Wegh, now called Broadway, and ended at the other shoreline (today's Trinity Place), where it took a turn south and ran along the shore until it ended at the old fort. There was a gate at Broadway (the "Land Gate") and another at Pearl Street, the "Water Gate." The wall and its fortifications were eventually removed in 1699—it had outlived its usefulness because the city had grown well beyond the wall. A new City Hall was built at Wall and Nassau in 1700 using the stones from the bastions as materials for the foundation. Slavery was introduced to Manhattan in 1626, but it was not until December 13, 1711, that the New York City Common Council made a market at the foot of Wall Street the city's first official slave market for the sale and rental of enslaved Africans and Indians. The slave market operated from 1711 to 1762 at the corner of Wall and Pearl Streets. It was a wooden structure with a roof and open sides, although walls may have been added over the years and could hold approximately 50 men. The city directly benefited from the sale of slaves by implementing taxes on every person who was bought and sold there. In these early days, local merchants and traders would gather at disparate spots to buy and sell shares and bonds, and over time divided themselves into two classes—auctioneers and dealers. In the late 18th century, there was a buttonwood tree at the foot of Wall Street under which traders and speculators would gather to trade securities. The benefit was being in proximity to each other. In 1792, traders formalized their association with the Buttonwood Agreement which was the origin of the New York Stock Exchange. The idea of the agreement was to make the market more "structured" and "without the manipulative auctions", with a commission structure. Persons signing the agreement agreed to charge each other a standard commission rate; persons