Thomas Bloomer was born around 1834 in New York. He may have moved to Rhode Island sometime before the Civil War. He enlisted in the Union army on September 13, 1861, and he mustered in as a private in Company H of the 4th Rhode Island Infantry on October 30. The regiment took part in the Battle of Roanoke Island, the Battle of New Bern, the Battle of Antietam, and the siege of Suffolk. He fell ill in November 1862, and Union officials sent him to a convalescent camp to recover. He rejoined the regiment in January 1863. He died of disease in Alexandria, Virginia, on October 11, 1864.