20th Regiment Massachusetts Volunteer Infantry

20th Regiment Massachusetts Volunteer Infantry
Active	August 29, 1861 – July 28, 1865
Country	United States of America
Allegiance	Union
Branch	United States Army
Type	Infantry
Part of	In 1863: 3rd Brigade (Hall's), 2nd Division (Gibbon's), II Corps, Army of the Potomac
Nickname(s)	"The Harvard Regiment"
Commanders
Notable commanders	Col. Paul J. Revere
Insignia
II Corps (2nd Division) badge

The 20th Massachusetts Volunteer Infantry, also known as the "Harvard Regiment", was a regiment of infantry in the American Civil War. The regiment was so nicknamed because the officers of the 20th were young Harvard graduates. In addition some, but not all, the private soldiers had attended Harvard. The 20th was organized at Readville August 29 to September 4, 1861. After training they left Massachusetts for Washington, D. C., September 4. They would fight until the war's conclusion; being mustered out on July 16 and discharged July 28, 1865.

Attached to Ladder's Brigade, Division of the Potomac, to October, 1861. Lander's Brigade, Stone's (Sedgwick's) Division, Army of the Potomac, to March, 1862. 3rd Brigade, 2nd Division, 2nd Army Corps, Army of the Potomac, to March, 1864. 1st Brigade, 2nd Division, 2nd Army Corps, to July, 1865.

With the exception of First Bull Run the 20th participated in all of the major battles and many of the smaller battles fought by the Army of the Potomac. Their baptism of fire occurred at Ball's Bluff on October 21, 1861. Other battles included the Seven Days, Fredericksburg, Chancellorsville, Gettysburg, the Wilderness, Spottsylvania Court House the Siege of Petersburg and the Appomattox Campaign.

The 20th regiment lost 17 officers and 243 enlisted men killed and mortally wounded. One officer and 148 enlisted men by disease. Total casualties were 409. The regiment ranks first among Massachusetts regiments and fifth among Union regiments in total casualties.

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