Darby Field claimed to have made the first ascent of Mount Washington in 1642. Field climbed the mountain in June of that year to demonstrate to the Abenaki chief Passaconaway that the Europeans bargaining for tribal land were not subject to the gods believed to inhabit the summit, a primarily political move that facilitated colonists' northern expansion. Field again summited Agiocochook in October 1642 on an early surveying expedition that created maps of land as far as Maine, maps that assisted the delegations from the Massachusetts colony seeking to acquire the more arable coastal regions.