Batterie Roon

Batterie Roon 6/HKAR 1265

This batterie had four French 22cm K 532(f) guns and there were 144 men assigned to Roon. (The 4 gun positions are highlighted on the map with red circles). Roon also had one MG311(f) in a Renault FT17 tank turret, multiple machine gun positions, a 5cm (Gr.W.36) mortar, 14 abwehrflammenwerfer 42 and two 150cm searchlights codenamed Attila and Armin

Of the four positions only two can be found, one is buried under Le Mont es Croix estate, the second is buried but you can make out where it was, the third is on the grounds of the prison (possibly lost) and the last is now a public area next to a small estate not of the prison.

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Map detailing the Batterie position fire points and equipment.

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Gun positions

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The Guns

Details of the K532(f) Gun (f) meaning French made (captured by the Germans)

Canon de 220 L Mle 1917 Schneider

Manufacturer: Schneider et Cie., Le Creusot, France
Calibre 220mm
Length of barrel L/35 (L34.87): 7,672.5mm
Length of rifling (L/26.80): 6,113.5mm
Twist of rifling 92 grooves, 7 degrees (to right)
Barrel construction Jacketed
Weights Barrel – 9,280kg (with breech block)
Traverse 360 degrees
Elevation 0 to +37 degrees
Ammunition 22cm Gr. 534 (f) weight: 104.05kg
M/velocity 754m/sec
Range : 21,600m
22cm Gr. 535 (f) weight: 104.75kg
M/velocity 766m/sec
Range: 22,800m
Charge weight 20kg
Rate of fire 1 round/minute

In August 1944 British destroyer HMS Onslaught was attacking a German convoy. The convoy came within range room and a few other batteries, the Germans opened fire and HMS Onslaught withdrew. During this exchange one of the 4 K532’s shells exploded in the breach killing a member of the gun crew and injuring many others. This K532 barrel can be seen in two pieces at Batterie Moltke (Gun number 3), as well as a recovered K532 barrel (from the gun graveyard). The last few pictures of the album show them.

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Two Anti Aircraft Batterie protected Batterie Roon

1./GemFlakAbt 364 (Air Force)
six 8.8cm Flak 37 and two 2cm Flak 38 guns and one Radar (Wurzburg Reise )

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Heeresflakzug 503 (Army)
Two 2cm four barrelled Flakvierling 38 on concrete gun emplacements

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Exploring bunkers:

• Always get permission from the owner
• Take a torch, a spare and one more for luck
• Don't go alone & tell someone where you will be and for how long
• You will get dirty as most are often full of rubbish and may have been used as a public toilet
• Anything you find still belongs to the person that owns the property
Unexploded ordnance is still found in Jersey if you see or find anything that looks like ordnance please call the bomb disposal officer on 01534 612 612.

Jargon Help

Widerstandsnest (WN) = Resistance Nest (RN)
Small pocket of resistance, these would be made up of small groups of up to 10 men with light weapons. They would man Anti-tank weapons, an observation post or a field gun.

Stützpunkt St.P = Strongpoint (STP)
Next level up from an RN and consisted of several RN's. STP areas would have a combination of weapons and different branches of the military used. Examples of this can be found with Strongpoint Greve de Lecq and Strongpoint Corbiere

Einsatzstellung = Operational Position or Action Post
Smaller MG type position generally it was only maned during an alert

Feldwache = Field Watch

Jäger Casemate was a special design and name for bunkers designed to hold a 10.5cm field gun

Sources of Information

German Documents are housed at The National Archived in Washington or Archive in Kew UK
T-78 Roll 318
T-78 Roll 317
T-315 Roll 1639
T-315 Roll 1643
T-311 Roll 27
T-312 Roll 1545

Operation Green Arrows - Occupation of the Channel Islands MOD 584
Allied Technical Intelligence Reports 1944-45
German Preparations for Invasion of the United Kingdom 1941-42
B-833, 319th Infantry Division (1941-45)
German Seacoast Defenses, European Theatre - prepared by the Seacoast Artillery Evaluation Board
Jersey Occupied by Michael Ginns - ISBN 978-1-905095-29-2
Operation Nestegg Plans
Operation Hardtack Plans
Operation Basalt Plans
RAF Photos care of The National Collection of Aerial Photography
Bundesarchiv - Multiple Photos - and Files
A Map of slave labour camps. Kindly Provided by Emilio Pérez
Photo's and information provided by fans
Onsite visits & internet research
After the Battle Multiple Magazines

If we have used any photos or information which you believe to posted without permission, please contact us at

Links of other excellent websites and people you must support.

The National Trust for Jersey are a fantastic group and we can not praise them enough for the work they do. Please go support them as their vision is to permanently protect Jersey's natural beauty, rich wildlife and historic places for everyone to enjoy and experience.

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Jersey Heritage look after multiple sites most with links to the Second World War and all worth a visit. The archive they have is amazing and one of the best sources of information. It can be used online or in person and we ask you to please support all they do.


The Channel Island Occupation Society are guardians of 5 sites which have all been restored or have been made to look like they did in the Second World War. Visits to these sites help fund the work they do and we encourage you to take a look at the opening times and visit them. They also have a wide range of books and reviews, all of which are an excellent resource for education.

Whether you are an established Battlefield Guide, retired from the craft, interested in how it is done or considering a future in guiding, the International Guild of Battlefield Guides is for you. Kimberley and Phil are both associate members and recommend you visit their website to show support.