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Thomas Francis Meagher, (born Aug. 23, 1823, Waterford, County Waterford, Ire.—died July 1, 1867, near Fort Benton, Mont., U.S.), Irish revolutionary leader and orator who served as a Union officer during the American Civil War (1861–65).
Meagher became a member of the Young Ireland Party in 1845 and in 1847 was one of the founders of the Irish Confederation, dedicated to Irish independence. In 1848 he was involved, with William Smith O’Brien, in an abortive attempt to mount an insurrection against English rule. Arrested for high treason, he was condemned to death, but his sentence was commuted to life imprisonment in Van Diemen’s Land (now Tasmania).
He escaped in 1852 and made his way to the United States. After a speaking tour of U.S. cities, he settled in New York City, studied law, and was admitted to the bar in 1855. He soon became a leader of the Irish in New York and, from 1856, edited the Irish News.
At the outbreak of the Civil War, Meagher became a captain of New York volunteers and fought at the First Battle of Bull Run (July 1861). He then organized the Irish Brigade, and in February 1862 was elevated to the rank of brigadier general. After his brigade was decimated at the Battle of Chancellorsville (May 1863), Meagher resigned his commission, but in December he returned to command the military district of Etowah, with headquarters at Chattanooga, Tenn.
At the close of the war, he was appointed secretary of Montana Territory, where in the absence of a territorial governor he served as acting governor until his accidental death by drowning in the Missouri River.