Mackie enlisted in the Marine Corps from New York on April 24, 1861. His first assignment was with the Marine Detachmenton board the USS Savannah. He was promoted to corporal on March 1, 1862. On April 1, he began serving on the ironclad warship USS Galena. On May 15, a five-ship Union Navy squadron, including the Galena, steamed up the James River to test the defenses of the Confederate capital, Richmond, Virginia. After reaching a bend in the river upstream of Dutch Gap, the squadron encountered submerged obstacles and heavy fire from two battalions of Confederate Marines positioned on the banks of the river and artillery fire from Fort Darling atop Drewry's Bluff about eight miles below Richmond. Mackie commanded 12 Marines on the gun deck. The fort's artillery batteries inflicted severe damage on the Galena and forced the Union squadron to turn back. During the battle, most of Galena's naval gun crew was killed or wounded. Mackie led a group of Marines who took over operation of the guns for the remainder of the battle. On November 1, he was promoted to orderly sergeant. In June 1863, he was assigned to the. On July 10, 1863, Mackie was awarded the Medal of Honor for his actions aboard the Galena on May 15, 1862. Mackie was particularly mentioned for his "gallant conduct and services and signal acts of devotion to duty". On October 11, 1863, he received the medal by U.S. Postal Service mail while aboard the Seminole which was anchored off Sabine Pass, Texas. Mackie was presented the Medal of Honor during a ceremony on the quarterdeck of the ship. He was honorably discharged from the Marine Corps on August 23, 1865, in Boston. Mackie and Sergeant Pinkerton Vaughn were the first Marines to be awarded the Medal of Honor. Mackie eventually married and settled near Philadelphia. He died at the age of 74 and is buried in Arlington Cemetery, in the Drexel Hill section of Upper Darby, Pennsylvania. At Drewry's Bluff, now within Richmond National Battlefield Park, a marker is posted which features Mackie's Medal of Honor action.
Medal of Honor citation
Mackie's Medal of Honor Citation reads: Rank and Organization: Corporal, U.S. Marine Corps
Born: 1836, New York, N.Y.
Accredited to: New York
G.O. No.: 17, 10 July 1863 Citation: On board the U.S.S. Galena, in the attack on Fort Darling, at Drewry's Bluff, James River, on May 15, 1862. As enemy shellfire raked the deck of his ship, Corporal Mackie fearlessly maintained his musket fire against the rifle pits along the shore and, when ordered to fill vacancies at guns caused by men wounded and killed in action, manned the weapon with skill and courage.
