(1838–39) Bloodless conflict over the disputed boundary between the U.S. state of Maine and the British Canadian province of New Brunswick.
As settlers from both countries moved into the disputed Aroostook area, officials and bands of men from both sides made arrests and took prisoners of "trespassers." In 1839 U.S. and Canadian troops were ordered to the area. A truce allowed joint occupancy of the territory until 1842, when a satisfactory settlement was reached.