In May 1751, the Mi'kmaq mounted their largest attack on British settlers with the Raid on Dartmouth. With this raid, the Mi'kmaq stopped British expansion and they stopped attacking. Cornwallis interpreted the cessation of attacks as the Mi'kmaq wanting peace. Cornwallis laid the foundation for and was at the signing of the Treaty of 1752 with Major Cope, attending at Cope's request. Having committed to being Governor only for two years, Cornwallis eventually resigned his commission and left the colony in October 1752. The treaty was ultimately rejected by most of the other Mi'kmaq leaders. Cope burned the treaty six months after he signed it.