Champlain returned to New France in 1620 and was to spend the rest of his life focusing on administration of the territory rather than exploration. Champlain spent the winter building Fort Saint-Louis on top of Cape Diamond. By mid-May, he learned that the fur trading monopoly had been handed over to another company led by the Caen brothers. After some tense negotiations, it was decided to merge the two companies under the direction of the Caens. Champlain continued to work on relations with the natives and managed to impose on them a chief of his choice. He also negotiated a peace treaty with the Iroquois.