Peak Activity, 1633-1659: During the middle decades of the 17th century, the mission system incorporated populations from major provinces such as Apalachee, Yustaga, Timucua, Mocama, and Guale, along with other more distant groups along the margins of the primary mission districts. Mission provinces provided a pivotal source of both labor and staple foods for the port city of St. Augustine, though occasional uprisings resulted in some forced resettlement and increasing (though still limited) Spanish military presence in the mission frontier.