The States General issued patents in 1614 for the development of New Netherland as a private, commercial venture. Soon after, traders built Fort Nassau on Castle Island in the area of Albany up Hudson's river. The fort was to defend river traffic against interlopers and to conduct fur trading operations with the Indians. The location of the fort proved to be impractical, however, due to repeated flooding of the island in the summers, and it was abandoned in 1618 when the patent expired.