Macomb, Alexander (məkōmˈ) [key], 1782–1841, American army officer, b. Detroit, Mich. He entered the army in 1799. In the War of 1812, as brigadier general in command at Plattsburgh, N.Y., in the absence of Gen. Ralph Izard, he repulsed (Sept. 11, 1814) the assault of a greatly superior force under Sir George Prevost; this action, accompanied by the complete defeat of a squadron on Lake Champlain by Thomas Macdonough, caused the British to retreat to Canada. From 1828 until his death he was commanding general of the U.S. army.
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