 Samoset returned to Plymouth on March 22 with a delegation from Massasoit that included Squanto ; Massasoit joined them shortly thereafter . After an exchange of gifts , Massasoit and Governor Carver established a formal treaty of peace . This treaty ensured that each people would not bring harm to the other , that Massasoit would send his allies to make peaceful negotiations with Plymouth , and that they would come to each other 's aid in a time of war . 
