In June 1607, a week after the initial Fort at Jamestown was completed, Newport sailed back for London on the "Susan Constant" with a load of pyrite ("fools' gold") and other supposedly precious minerals, leaving behind 104 colonists, and the tiny "Discovery" for the use of the colonists. The "Susan Constant", which had been a rental ship that had customarily been used as a freight transport, did not return to Virginia again. However, Newport did return twice from England with additional supplies in the following 18 months, leading what were termed the First and Second Supply missions. Despite original intentions to grow food and trade with the Native Americans, the barely surviving colonists became dependent upon the supply missions. Before the arrival of the First Supply, over half of the colonists perished in the winter of 1607–08.