1st Battalion, 11th Marines

1st Battalion, 11th Marines
1/11 Insignia
Active	20 August 1917 – 11 August 1919 3 December 1923 – 1 October 1947 1 October 1949 – present
Country	United States of America
Branch	United States Marine Corps
Type	Artillery
Role	Provide fire support to the 1st Marine Division
Size	800
Part of	11th Marine Regiment 1st Marine Division
Garrison/HQ	Marine Corps Base Camp Pendleton San Diego County, California
Motto(s)	"Ultima Ratio Regum" "The Final Argument of Kings"
Engagements	World War II Guadalcanal campaign Battle of Cape Gloucester Battle of Peleliu Battle of Okinawa Korean War Battle of Pusan Perimeter Battle of Inchon Battle of Chosin Reservoir Vietnam War Gulf War War on terror Iraq War Operation Enduring Freedom War against the Islamic State
Commanders
Current commander	LtCol Daniel J. O'Connell
Notable commanders	Harry K. Pickett Lewis J. Fields

1st Battalion, 11th Marines (1/11) is an artillery battalion comprising five firing batteries and a Headquarters battery. The battalion is stationed at the Marine Corps Base Camp Pendleton in California. Its primary weapon system is the M142 HIMARS rocket artillery launcher and the M777 lightweight howitzer. The battalion is under the command of the 11th Marine Regiment, part of the 1st Marine Division.