The Unattached Companies of Massachusetts Volunteer Militia were units of infantry raised for the defenses of the eastern coast of Massachusetts during the American Civil War. Twenty-six companies were mustered into the Union Army during 1864-1865, several of them reorganizing for additional terms of service.
The 4th Massachusetts Volunteer Heavy Artillery Regiment was a unit that served in the Union Army during the latter part of the American Civil War. It was formed from former Unattached Companies of Heavy Artillery raised by Massachusetts to serve the state and for the defenses of Washington, D.C.
The 3rd Massachusetts Volunteer Heavy Artillery Regiment was a unit that served in the Union Army during the American Civil War. It was organized from already mustered unattached companies of heavy artillery raised for the defenses of the Massachusetts coast.
The 1st Battalion of Massachusetts Volunteer Heavy Artillery was a unit that served in the Union Army during the American Civil War. It was organized from several unattached companies of heavy artillery already raised and mustered into a three-year service for the defenses of the Massachusetts coast.
Battery L, 2nd Illinois Light Artillery Regiment was an artillery battery that served in the Union Army during the American Civil War. It was also referred to as Bolton's Battery, Hulaniski's Battery, and Nichols' Battery. The battery fought at Shiloh, Corinth, Hatchie's Bridge, Port Gibson, Raymond, Jackson, Champion Hill, Vicksburg, and Yazoo City. The unit mustered out in August 1865.
The 17th Massachusetts was an infantry regiment that served in the Union Army during the American Civil War.
The 3rd Massachusetts Battery, was an artillery battery that served in the Union Army during the American Civil War.
The 40th Regiment, Massachusetts Volunteer Infantry Regiment was a three-year infantry regiment of the Union Army that served in the Department of Virginia and North Carolina, the Army of the Potomac, and the Department of the South during the American Civil War.
The 3rd Massachusetts Volunteer Cavalry Regiment was a cavalry regiment that served in the Union Army during the American Civil War. It was organized by consolidating the 41st Massachusetts Mounted Infantry and the 2nd Battalion Massachusetts Cavalry on June 17, 1863. The regiment served with the XIX Corps, Army of the Gulf during the Red River Campaign in 1864. Its heaviest combat during this campaign took place during the Battle of Sabine Crossroads.
The 1st Massachusetts Battery was a peacetime militia artillery battery that was activated for federal service in the Union army for two separate tours during the American Civil War. Prior to the war and during its first term of service, the unit was sometimes known as "Cook's Battery" after its commanding officer, Capt. Asa M. Cook. During its first term, the battery primarily served garrison duty in Baltimore, Maryland. Almost immediately after mustering out, the unit began preparing for a second term, this time volunteering to serve for three years. The battery was attached to the VI Corps of the Army of the Potomac during its second term and took part in some of the largest battles of the war including the Fredericksburg, Chancellorsville, Gettysburg, and Lieutenant General Ulysses S. Grant's Overland Campaign in the spring of 1864.
The 4th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The unit was sometimes known as "Manning's Battery" after its commanding officer, Capt. Charles H. Manning. It was one of the Massachusetts regiments organized in response to President Abraham Lincoln's call on May 2, 1861 for volunteer troops to serve a term of three-years. The core of the unit was a peace-time militia company known as the Salem Light Artillery. The battery trained at Camp Chase in Lowell, Massachusetts. It was assigned to the Department of the Gulf under Major General Benjamin F. Butler and departed Boston by steamship on November 20.
The 5th Massachusetts Battery was an artillery battery that served in the Union army during the American Civil War. It was one of the Massachusetts regiments organized in response to President Abraham Lincoln's call on May 2, 1861 for volunteer troops to serve a term of three-years. The battery trained at Camp Shouler in Lynnfield, Massachusetts and Camp Massasoit in Readville, Massachusetts. It departed Boston by steamship on December 25, 1861.
The 6th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The unit was one of the Massachusetts regiments organized in response to President Abraham Lincoln's call on May 2, 1861 for volunteer troops to serve a term of three-years. The battery trained at Camp Chase in Lowell, Massachusetts. It was assigned to the Department of the Gulf under Major General Benjamin F. Butler and departed Boston by steamship on February 8, 1862. At that time, the unit comprised 145 men armed with two rifled and four smoothbore six-pounder field guns.
The 7th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The original core of the unit was a company of infantry known as the Richardson Light Guard. The company initially served provost duty at Fortress Monroe, was eventually trained in light artillery drill, and reorganized on March 17, 1862 as the 7th Massachusetts Battery.
The 11th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. It was formed in response to President Abraham Lincoln's August 1862 call for 300,000 men to serve for nine months. Several months after completing their first term of service, the battery was reorganized for a second term of three years. It was recruited by Captain Edward J. Jones of Boston and consisted almost entirely of men from that city. The battery served a largely uneventful first term as garrison troops mostly in Centreville, Virginia. During their second term they were involved in heavy combat being part of the Army of the Potomac during Lieutenant General Ulysses S. Grant's Overland Campaign.
The 12th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The unit was organized at Camp Meigs near Boston during the fall of 1862. Its members were mustered in at various times over the fall and the officers mustered into federal service on December 8, 1862. It was assigned to the Department of the Gulf under Major General Nathaniel P. Banks and departed Massachusetts by steamship on January 3, 1863.
The 13th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The unit was organized at Camp Meigs near Boston during the fall of 1862. Its members were mustered in at various times over the fall and the officers mustered into federal service on November 3, 1862. It was assigned to the Department of the Gulf commanded by Major General Nathaniel P. Banks and departed Massachusetts by steamship on January 20, 1863.
The 14th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. It was organized during the winter of 1863 - 1864 at Camp Meigs just outside of Boston. It was commanded by Captain Joseph W. B. Wright of Boston and consisted mostly of men from that city. The enlisted men were mustered into federal service on February 27, 1864. They departed Massachusetts on April 4, 1864, arrived at Annapolis and then moved to Camp Marshall in Washington, D.C. On April 22 and 24 they were outfitted with field guns and horses but had virtually no time to train in light artillery tactics before they were assigned to the IX Corps of the Army of the Potomac and joined Lieutenant General Ulysses S. Grant's Overland Campaign.
The 15th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The unit was organized partly at Camp Chase in Lowell, Massachusetts and partly at Fort Warren during the winter of 1862-1863. The majority of its members were mustered into federal service on February 17, 1863. It was assigned to the Department of the Gulf commanded by Major General Nathaniel P. Banks and departed Massachusetts by steamship on March 9. During its term, the unit suffered from a large number of desertions and gained an unfortunate reputation despite the service of its many loyal members.
The 16th Massachusetts Battery was an artillery battery that served in the Union Army during the American Civil War. The last battery of light artillery sent by Massachusetts, it was organized during the late winter of 1864 at Camp Meigs just outside of Boston. The battery was commanded by Captain Henry D. Scott of New Bedford, Massachusetts. The majority of enlisted men and officers were mustered into federal service on March 11, 1864. They departed Massachusetts on April 19, 1864, arriving at Washington of April 21. The unit was directed to Camp Barry just outside Washington and was there outfitted with 3-inch field guns and horses. It was assigned to the XXII Corps in the defenses of Washington. Serving primarily in the fortifications around Washington, the battery never saw active combat.
United States 
