Living in the American Northeast before the war, Romerson enlisted in the Union Navy in 1863 as part of the Blockading Squadrons responsible for maintaining the blockade of the ports of the Confederacy. After being discharged from naval service, he reenlisted in the Union Army under the 5th Regiment Massachusetts Colored Volunteer Cavalry, a United States Colored (USCT) regiment, and was promoted to the rank of sergeant on June 1, 1864. Romerson fought with the 5thUSCC until the end of the war. Illness prevented him from continuing with his regiment's reassignment to Clarksville, Texas, and he was mustered out in 1865. After the war, like many former USCT veterans, he remained in the army on the frontier as one of the Buffalo Soldiers. He died in 1872.