Jeremiah Lanahan was born around 1830 in Ireland. He eventually immigrated to America and settled in Providence, Rhode Island. He married a woman named Mary, and they apparently had no children.

 

In August 1861, he received a commission as a 2^nd lieutenant in Company I of the 3^rd Rhode Island Heavy Artillery. The regiment took part in the siege of Charleston and the Battle of Honey Hill. He was promoted to 1^st lieutenant in October 1861 and to captain in July 1862. He mustered out on March 17, 1865.

 

He worked as a clerk after the war. He enlisted in the Regular Army in March 1867, and he mustered in as a private. According to his enlistment records, he was 5 feet, 11 ¾ inches tall, with gray hair and blue eyes. He reenlisted three years later, and by July 1870, he was working as a clerk in the War Department. He died in Washington, D.C., on July 2, 1873.

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