 Besides Roger Williams , Arnold was the only member of the colony who was highly proficient in the Narragansett and Wampanoag tongues , and he was often called upon to interpret during negotiations . In June 1645 he was sent by the General Court of Massachusetts to the Narragansett people to urge them to desist from engaging in a war with the Mohegans . On 28 July of the same year Arnold and two others were sent out to get the hostile tribes to send deputies to Boston to talk and make peace . This attempt failed , and a month later Arnold would not go back again , as he had been charged with mis @-@ representing the reply of the tribes two months earlier , and Roger Williams went as interpreter in his place . 
