Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Thomas William Sweeny (December 25, 1820 April 10, 1892) was an Irish soldier who served in the Mexican-American War and then was a general in the Union Army during the American Civil War.Sweeny was born at Cork, Ireland, on Christmas Day, 1820. He immigrated to the United States in 1833. In 1846, he enlisted as a second lieutenant in Burnett''s New York Volunteers, and fought under General Winfield Scott in Mexico. During the Battle of Churubusco, he was seriously wounded to his right arm, causing it to be amputated. Despite this possible career-ending injury, he continued serving with the 2nd US Infantry until the outbreak of the Civil War.