When the Spanish arrived in the area, trade between the long established Pueblo peoples and the Southern Athabaskan was well established. They reported the Pueblo exchanged maize and woven cotton goods for bison meat, and hides and materials for stone tools. Coronado observed the Plains people wintering near the Pueblo in established camps. Later Spanish sovereignty over the area disrupted trade between the Pueblo and the diverging Apache and Navajo groups. The Apache quickly acquired horses, improving their mobility for quick raids on settlements. In addition, the Pueblo were forced to work Spanish mission lands and care for mission flocks; they had fewer surplus goods to trade with their neighbors.