40th New York Infantry Regiment

40th New York Infantry Regiment
Active	June 27, 1861, to June 27, 1865
Country	United States
Allegiance	Union
Branch	Infantry
Nickname(s)	"Mozart Regiment" or the "Constitution Guard"
Engagements	Battle of Ball's Bluff Peninsular Campaign Second Battle of Bull Run Battle of Chantilly Battle of Fredericksburg Battle of Chancellorsville Battle of Gettysburg Battle of the Wilderness Battle of Cold Harbor Siege of Petersburg First Battle of Deep Bottom

The 40th New York Infantry Regiment, also known as the "Mozart Regiment" or the "Constitution Guard", was an infantry regiment that served in the Union Army during the American Civil War.

The 40th New York also had the 2nd highest numbers of casualties of any New York Regiment, behind the famous 69th New York Infantry of the Irish Brigade.