After the departure of Massasoit and his men, Squanto remained in Plymouth to teach the Pilgrims how to survive in New England, such as using dead fish to fertilize the soil. For the first few years of colonial life, the fur trade was the dominant source of income beyond subsistence farming, buying furs from Natives and selling to Europeans. Governor Carver suddenly died shortly after the "Mayflower" returned to England. William Bradford was elected to replace him and went on to lead the colony through much of its formative years.