He entered the army as a second lieutenant of artillery. After garrison duty in the harbor of New York in 1812–13, he was ordered to the Niagara frontier in 1813 for service in the War of 1812. He assisted in the capture of Fort George (May 27, 1813) and was made prisoner at Fort Niagara on December 19, 1813. He was exchanged and transferred to the Artillery Corps on May 12, 1814.
During the Civil War, he was so successful as a recruiter in Connecticut and Rhode Island that President Lincoln made him Superintendent of General Recruiting for the entire Union army at Fort Columbus, New York.[1] He also served as commandant of the prisoner of war camp at Fort Columbus.[2]
On June 1, 1863, Loomis was retired from active duty as a colonel of infantry, but was immediately recalled to duty.[3] In 1864 he was assigned as a senior court martial officer at Fort Columbus. He remained on active duty after the war to process administrative and court martial proceedings. In 1867 he was still in uniform, managing army supply, personnel, and administrative issues related to his duties as a court martial officer.[2]
Gustavus Loomis died on March 5, 1872, at Stratford Connecticut.[1] He was buried at Grove Street Cemetery, New Haven, Connecticut.[1] Throughout his life in the military he was often known as a Christian officer.[4]
^ abLawson, Kenneth E., For Christ and Country: A Biography of Brigadier General Gustavus Loomis. Greenville, SC: Ambassador International, 2011. ISBN978-1-935507-47-5. p. 376
^Lawson, Kenneth E., For Christ and Country: A Biography of Brigadier General Gustavus Loomis. Greenville, SC: Ambassador International, 2011. ISBN978-1-935507-47-5. p. 383
^Lawson, Kenneth E., For Christ and Country: A Biography of Brigadier General Gustavus Loomis. Greenville, SC: Ambassador International, 2011. ISBN978-1-935507-47-5. pp. 383–384