"The Border between Maine and the Canadian province of New Brunswick had never been defined. Both the United States and Canada claimed some 12,000 square miles along the Aroostook River. The "war," though bloodless, heated up in February 1839 when Canadian authorities arrested American Rufus McIntire for attempting to expel Canadians from the disputed region. MicIntire had been acting on orders from Maine officials. Both sides immediately massed their militias along the frontier and sought support from their parent governments. As in the Caroline affair, President Van Buren resisted cries for war and instead dispatched General Winfield Scott on a peace mission to the region. Scott arranged a truce, effectively defusing the crisis pending the settlement of the border issue by the Webster-Ashburton Treaty in 1842."