U.S. 4th Cavalry Regiment

4th Cavalry
4th Cavalry Regiment coat of arms
Active	1855- present
Country	United States
Branch	United States Army
Type	Armored cavalry
Motto(s)	"Prepared and Loyal"
Colors
Engagements	American Civil War Indian Wars Philippine Insurrection World War II Vietnam War War in Southwest Asia Global War on Terrorism Iraq Campaign
Commanders
Notable commanders	Edwin V. Sumner (1855-58) Joseph E. Johnston (1855-60) Robert E. Lee (1861) Ranald S. Mackenzie (1871-81) H. R. McMaster (1999-2002; 1st Squadron)
Insignia
Distinctive unit insignia

The 4th Cavalry Regiment is a United States Army cavalry regiment, whose lineage is traced back to the mid-19th century. It was one of the most effective units of the Army against American Indians on the Texas frontier. Today, the regiment exists as separate squadrons within the U.S. Army. The 1st Squadron of the 4th Cavalry's official nickname is "Quarterhorse", which alludes to its 1/4 Cav designation. The 3rd Squadron of the 4th Cavalry's official nickname is "Raiders". Today, the "1st Squadron, 4th Cavalry", "2nd Squadron, 4th Cavalry", "4th Squadron, 4th Cavalry", and "6th Squadron, 4th Cavalry" are parts of the 1st Infantry Division, while the "3rd Squadron, 4th Cavalry" serves as part of the 25th Infantry Division. On 23 September 2009, the "4th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 1st "Devil" Brigade, 1st Infantry Division. On 28 March 2008, the "5th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 2nd "Dagger" Brigade, 1st Infantry Division. The 6th Squadron, 4th Cavalry served as part of the recently inactivated 1st Infantry Division, 3rd "Duke" Brigade, at Fort Knox, Kentucky.

In 1855, the United States Congress recognized the need for mounted regiments in the U.S. Army in addition to the First and Second Regiments of Dragoons and the Regiment of Mounted Riflemen. The 1st Cavalry Regiment—later re-designated as the 4th Cavalry Regiment—was organized under the act of 3 March 1855. On 26 March 1855, the regiment was organized at Jefferson Barracks, Missouri. The regiment's first commander was Colonel Edwin V. Sumner, who served from 3 March 1855 to 16 March 1861. In August 1855, the regiment was transferred to Fort Leavenworth, Kansas. Colonel Sumner had two missions. The first was to keep the peace between the pro-slavery and free state factions in Kansas; the second was to protect settlers from attacks by Cheyenne warriors.