Exercise Mainbrace

Exercise Mainbrace
Part of Cold War (1947–1953)
300px NATO Northern Flank
Type	NATO combined naval training exercises
Location	North Atlantic Ocean, GIUK Gap, Norwegian Sea, Barents Sea, North Sea, Jutland Peninsula, and Baltic Sea
Planned by	SACLANT & SACEUR
Objective	Deployment of NATO anti-submarine warfare forces, aircraft carrier strike forces, and supply convoys
Date	September 14–25, 1952
Executed by	Admiral Sir Patrick Brind, RN (CINCNORTH)
Outcome	Exercise successfully executed.

Exercise Mainbrace was the first large-scale naval exercise undertaken by the newly established Allied Command Atlantic (ACLANT), one of the two principal military commands of the North Atlantic Treaty Organization (NATO). It was part of a series of NATO exercises jointly commanded by Supreme Allied Commander Atlantic Admiral Lynde D. McCormick, USN, and Supreme Allied Commander Europe General Matthew B. Ridgeway, U.S. Army, during the Fall of 1952.

Naval activities in north Atlantic, 1946-1951

File:USS Midway (CVB-41) during Operation Frostbite, March 1946.jpg

Operation Frostbite (1946)

The strategic importance of control of Norway and the adjacent Norwegian and Barents seas was recognized by Anglo-American naval planners as early as the First World War. The invasion and Occupation of Norway by Nazi Germany Norway during World War II confirmed the importance of the region, as Germany was able to establish bases for submarine and air operations against Allied convoys bound for the Soviet seaport of Murmansk.

Following the Second World War, several former allied navies executed a number of individual and multinational exercises, including:

• Operation Frostbite (pictured), a 1946 naval exercise involving U.S. Navy Task Group 21.11 led by the aircraft carrier USS Midway (CVB-41) that operated in the Davis Straits between Labrador and Greenland;
• Exercise Verity, a 1949 combined naval exercise involving the British, French, and Dutch navies which carried out naval bombardment, convoy escort, minesweeping, and Motor Torpedo Boat attack evolutions;
• Exercise Activity, a 1950 Dutch-led naval exercise to refine combined communications and tactical procedures; and
• Exercise Progress, a 1951 French-led combined naval operation with Belgian, French, Danish, Dutch, Norwegian, and British naval units that participating in antisubmarine warfare operations, air defense maneuvers, minesweeping operations, and convoy exercises.

Operational history

Initial planning for Exercise Mainbrace was initiated by General Dwight D. Eisenhower prior to his resignation as NATO's Supreme Allied Commander Europe (SACEUR) to run for the President of the United States. The exercise itself was commanded jointly by SACLANT Admiral Lynde D. McCormick, USN, and SACEUR General Matthew B. Ridgeway, U.S. Army, with the immediate theater commander being Admiral Sir Patrick Brind, RN, who was in Commander-in-Chief Allied Forces Northern Europe.

Mainbrace was conducted over twelve days between September 14–25, 1952, and involved nine navies: United States Navy, the British Royal Navy, French Navy, Royal Canadian Navy, Royal Danish Navy, Royal Norwegian Navy, Portuguese Navy, Royal Netherlands Navy, and Belgian Naval Force operating in the Norwegian Sea, the Barents Sea, the North Sea near the Jutland Peninsula, and the Baltic Sea. Its objective was to convince Denmark and Norway that those nations could be defended against attack from the Soviet Union. The exercise featured simulated carrier air strikes against "enemy" formation attacking NATO's northern flank near Bodø, Norway, naval air attacks against aggressors near the Kiel Canal, anti-submarine and anti-ship operations, and U.S. marines landing in Denmark.

Force composition

Seas break over the bow of HMS Vanguard making a high speed run

Eighty thousand men, over 200 ships, and 1,000 aircraft participated in the Mainbrace. The New York Times' military reporter Hanson W. Baldwin described this NATO naval force as being the "largest and most powerful fleet that has cruised in the North Sea since World War I."

Naval Forces - Operation Mainbrace, 1952

NATO member	Aircraft carriers	Battleships	Cruisers	Escorts	MCM	Submarines	Torpedo boat squadrons	Motor ships/Naval trawlers	Grand Total
United States	6	1	3	40	—	9	—	—	59
UK	3	1	2	31	—	17	4	8 + Trawlers	66
Canada	1	—	1	5	—	—	—	—	7
France	—	—	—	7	11	—	—	2	20
Denmark	—	—	—	3	2	2	—	—	7
Norway	—	—	—	2	16	2	3	3	26
Portugal	—	—	—	3	—	—	—	—	3
Netherlands	—	—	—	5	—	3	—	5	13
Belgium	—	—	—	—	2	—	—	—	2
TOTALS:	10	2	6	96	31	33	7	18	203

Blue Fleet Fast Carrier Task Force

USS Franklin D. Roosevelt with Carrier Air Group 17 (CVG-17):

Fighter Squadron 171 (VF-171) Fighter Squadron 172 (VF-172) Fighter Squadron 174 (VF-174) Attack Squadron 175 (VA-175)	Fleet Composite Squadron 12 (VC-12) Detachment 42 Fleet Composite Squadron 33 (VC-33) Detachment 42 Fleet Composite Squadron 62 (VC-62) Detachment 42 Utility Helicopter Squadron 2 (HU-2) Detachment 41

USS Midway with Carrier Air Group 6 (CVG-6):

Fighter Squadron 61 (VF-61) Fighter Squadron 42 (VF-42) Fighter Squadron 41 (VF-41) Fighter Squadron 21 (VF-21) Attack Squadron 25 (VA-25)	Fleet Composite Squadron 8 (VC-8) Fleet Composite Squadron 12 (VC-12) Detachment 41 Fleet Composite Squadron 33 (VC-33) Detachment 41 Fleet Composite Squadron 62 (VC-62) Detachment 41 Utility Helicopter Squadron 2 (HU-2) Detachment 41

USS Wasp and Carrier Air Group 1 (CVG-1):

Fighter Squadron 14 (VF-14) Fighter Squadron 12 (VF-12) Attack Squadron 15 (VA-15)	Fleet Composite Squadron 62 (VC-62) Detachment 18 Fleet Composite Squadron 12 (VC-12) Detachment 18 Utility Helicopter Squadron 2 (HU-2) Detachment 18

HMS Eagle:

800 Naval Air Squadron 803 Naval Air Squadron 809 Naval Air Squadron 812 Naval Air Squadron	814 Naval Air Squadron 827 Naval Air Squadron 849 Naval Air Squadron Ship Flight 1

HMS Illustrious:

• 4 Naval Air Squadron
• 824 Naval Air Squadron
• 860 Naval Air Squadron - Royal Netherlands Navy

Light aircraft carriers

• USS Wright
• HMS Theseus
• HMCS Magnificent

Escort aircraft carriers

• USS Mindoro
• USS Salerno Bay

Battleships

• USS Wisconsin
• HMS Vanguard

Cruisers

• USS Quincy
• USS Columbus
• USS Des Moines
• HMS Swiftsure
• HMCS Quebec

Amphibious force flagship

• USS Mount Olympus
• USS Tidewater

Gallery

• 

  HMS Vanguard

• USS Midway.jpg

  USS Midway

• HMS Eagle (R05) after her commissioning 1951.jpg

  HMS Eagle

• HMS Vanguard (Battleship, 1946-1960)1.jpg

  HMS Vanguard

• Lynde D McCormick.jpg

  Admiral McCormick

• RN MTBs underway during Operation Mainbrace 1952.jpg

  British MTBs underway

Other NATO Military Exercises - Fall 1952

Exercise Mainbrace was part of a series of NATO exercise jointly commanded by Admiral McCormick and General Ridgeway during the Fall of 1952 involving 300,000 military personnel engaged in maneuvers from the Arctic Circle to the Mediterranean Sea.

Two exercises were conducted by NATO's Allied Forces Southern Europe during the Fall of 1952. Ancient Wall was a series of military maneuvers involving ground small unit tactical training, land-based tactical air support, and carrier-based air support. Longstep was a ten-day naval exercise held in the Mediterranean Sea during November 1952 involving over 170 warships and 700 aircraft under the overall command of Admiral Carney. The objective of the Allied ("Blue") forces was to dislodge enemy ("Green") invasion forces from their occupying positions in the Eastern Mediterranean. Blue naval forces were centered around the U.S. Sixth Fleet, under the command of Vice Admiral John H. Cassady, USN, and its two aircraft carriers, the Franklin D. Roosevelt and Wasp. Green forces included submarines and land-based aircraft. The exercise concluded with an amphibious landing at Lebidos Bay south of İzmir, involving 3000 French, Italian, and Greek troops, including the Battalion Landing Team 3/2, under the overall command of General Robert E. Hogaboom, USMC.

Aftermath

The Soviet Union characterized Mainbrace, Holdfast, and other NATO military exercises as "war-like acts" by NATO, with particular reference to the participation of Norway and Denmark, while the USSR was preparing for its own military maneuvers in the Soviet Zone.

See also

• Cold War (1953-1962)
• Northern Wedding
• Operation Grand Slam (NATO)
• Operation Strikeback

Sources and references

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.

• Sydney Morning Herald - "NATO Ships Enter Baltic Sea" - September 16, 1952
• Time Magazine, "Operation Mainbrace", September 22, 1952
• Time Magazine, "NATO: Hedgehogs", September 29, 1952

External links

• All Hands magazine online
  • October 1952
  • November 1952
  • January 1953
• Photo Gallery - Operation Mainbrace- CV41.org
  • Senior officials in the NATO military structure, from 1949 to 2001
  • NATO the first five years 1949-1954:
    • Chapter 7 — The Military Structure
    • Chapter 9 — The Increase in Strength - International Exercises
    • Appendix 1 — Chronicle
    • Annex — Chapter IX-B: Soviet armed strength (as estimated in 1954)
• "Exercise Mainbrace" - Pathé Films online