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