Nehemiah Mayo Dyer (aka. N. Mayo Dyer; February 19, 1839 – January 27, 1910) was a rear admiral in United States Navy, who served during the American Civil War and Spanish–American War. He was one of the few individuals to have served in both the Battle of Mobile Bay during the Civil War and the Battle of Manila Bay during the Spanish–American War. Biography Nehemiah Mayo Dyer was born in Provincetown, Massachusetts, to Henry and Sally (Mayo) Dyer. He was educated in the public schools. He "followed the sea" from 1854 to 1859. He had mercantile employment from 1859 to 1861. Civil War service With the outbreak of the American Civil War, he enlisted 13th Massachusetts Volunteer Infantry Regiment in July 1861. He transferred to the Volunteer Navy as an acting master's mate on April 4, 1862. He served at the Boston Navy Yard from 1862 to 1863; the from 1863 to 1864. He was promoted for gallant services to acting ensign on May 18, 1863. He was assigned to the USS Metacomet in 1864 as part of the West Gulf Blockading Squadron under Rear Admiral David Farragut. On June 30, 1864, Mayo, in command of the , forced blockade-running steamer Ivanhoe to run aground near Fort Morgan at Mobile Bay. Because the steamer was protected by the fort's guns, Rear Admiral Farragut attempted at first to destroy her by long-range fire from the Metacomet and the USS Monongahela. When this proved unsuccessful, Farragut authorized his flag lieutenant, J. Crittenden Watson, to lead a boat expedition to burn Ivanhoe. Under the cover of darkness and the ready guns on board USS Metacomet and the USS Kennebec, Watson led four boats directly to the grounded steamer and fired her in two places shortly after midnight July 6. Mayo was promoted to acting master for gallant service aboard USS Metacomet during the Battle of Mobile Bay, August 4–5, 1864. After the war, he joined the Massachusetts Commandery of the Military Order of the Loyal Legion of the United States and was assigned insignia number 8854. Post–Civil War career In April 1866, he was ordered to report to the Bureau of Navigation in Washington and remained there on special duty until May 1868. On March 12, 1868, he was promoted to lieutenant, and on August 27, joined the at Valparaiso, Chile. He was promoted to lieutenant-commander on December 28, 1868, and from September